Revert "Removed module power-blockchain"

This reverts commit ab3de2227520db03110762886e2a956ee5c7ccea.

pom.xml

@@ -63,6 +63,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
         <module>power-xml</module>
         <module>power-reflection</module>
         <module>power-mail</module>
+        <module>power-blockchain</module>
 
         <module>power-security</module>
         <!-- TODO:

power-blockchain/pom.xml

@@ -0,0 +1,122 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ power-framework: Java library with many purposes of usage.
+ Copyright (C) 2016-2022 the original author or authors.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation;
+ version 2.1 of the License only.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.nanoboot.powerframework</groupId>
+        <artifactId>power-framework</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+    </parent>
+    
+    <groupId>org.nanoboot.powerframework</groupId>
+    <artifactId>power-blockchain</artifactId>
+    <packaging>jar</packaging>
+
+    <name>Power Blockchain</name>
+    <description>Blockchain library</description>
+
+    <build>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.3.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>org.nanoboot.powerframework.blockchain.orig.core.Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id> <!-- this is used for inheritance merges -->
+                        <phase>package</phase> <!-- bind to the packaging phase -->
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>org.nanoboot.powerframework.blockchain.orig.core.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <!-- Power dependencies -->
+        <dependency>
+            <groupId>org.nanoboot.powerframework</groupId>
+            <artifactId>power-core</artifactId>
+            <version>${power.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.nanoboot.powerframework</groupId>
+            <artifactId>power-time</artifactId>
+            <version>${power.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.nanoboot.powerframework</groupId>
+            <artifactId>power-json</artifactId>
+            <version>${power.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.nanoboot.powerframework</groupId>
+            <artifactId>power-random</artifactId>
+            <version>${power.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.nanoboot.powerframework</groupId>
+            <artifactId>power-security</artifactId>
+            <version>${power.version}</version>
+        </dependency>
+
+        <!-- Other dependencies -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.10</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+</project>

power-blockchain/src/main/java/module-info.java

@@ -0,0 +1,34 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+module powerframework.blockchain {
+    requires lombok;
+    requires powerframework.core;
+    requires powerframework.time;
+    requires powerframework.json;
+    requires powerframework.random;
+    requires powerframework.security;
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/api/BlockDeserializer.java

@@ -0,0 +1,33 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.api;
+
+import org.nanoboot.powerframework.blockchain.core.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockDeserializer {
+    Block deserialize(String serializedBlock);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/api/BlockSerializer.java

@@ -0,0 +1,33 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.api;
+
+import org.nanoboot.powerframework.blockchain.core.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockSerializer {
+    String serialize(Block block);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/core/Block.java

@@ -0,0 +1,132 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.core;
+
+import org.nanoboot.powerframework.blockchain.api.BlockSerializer;
+import org.nanoboot.powerframework.json.JsonObject;
+import org.nanoboot.powerframework.json.JsonObjectSerializable;
+import org.nanoboot.powerframework.security.hash.api.HashCalculator;
+import org.nanoboot.powerframework.time.moment.UniversalDateTime;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class Block implements JsonObjectSerializable {
+    private static final String BLOCKCHAIN_PROTOCOL = "blockchainProtocol";
+
+    private static final String HEIGHT = "height";
+
+    private static final String PREVIOUS_HASH = "previousHash";
+    private static final String TIMESTAMP = "timestamp";
+    private static final String DIFFICULTY = "difficulty";
+    private static final String DATA = "data";
+    private static final String NONCE = "nonce";
+
+    @Getter
+    private final BlockchainProtocol blockchainProtocol;
+
+    @Getter
+    private final long height;
+    @Getter
+    private final String previousHash;
+    @Getter
+    private final String timeStamp;
+    @Getter
+    private final String difficultyTarget;
+    @Getter
+    private final byte[] data;
+
+    @Getter
+    private long nonce;
+
+    //
+    @Getter
+    private String hash = null;
+
+    //Block Constructor.
+    public Block(BlockchainProtocol blockchainProtocol,
+                 long height,
+                 String previousHash,
+                 String difficultyTarget,
+                 byte[] data) {
+        this.blockchainProtocol=blockchainProtocol;
+        this.height = height;
+        this.previousHash = previousHash;
+        this.timeStamp = UniversalDateTime.now().toString();
+        this.difficultyTarget = difficultyTarget;
+        this.data = data;
+    }
+
+    //Calculate new hash based on blocks contents
+    public String calculateHash(HashCalculator hashCalculator, BlockSerializer blockSerializer) {
+        String serializedBlock = blockSerializer.serialize(this);
+        String calculatedhash = hashCalculator.hash(serializedBlock);
+        return calculatedhash;
+    }
+
+    //Increases nonce value until hash target is reached.
+    public void mineBlock(HashCalculator hashCalculator, BlockSerializer blockSerializer) {
+        String target = this.difficultyTarget;
+
+        for (long i = 0; i <= Long.MAX_VALUE; i++) {
+            this.nonce = i;
+            if (nonce == Integer.MAX_VALUE) {
+                throw new BlockChainException("Nonce was not found.");
+            }
+            if (nonce % 1000000 == 0) {
+                System.out.println("Nonce # " + nonce);
+            }
+
+
+
+            String hash = calculateHash(hashCalculator, blockSerializer);
+
+            if (hashCalculator.compareHexNumbers(hash, this.getDifficultyTarget()) <= 0) {
+                System.out.println("Found nonce: " + nonce + " A new block was just mined: " + getHash() + "\n" /*+ block.toJsonObject().toPrettyString()*/);
+                System.out.println("Block Mined!!! : " + hash);
+                break;
+            }
+        }
+
+    }
+
+    @Override
+    public JsonObject toJsonObject() {
+
+        JsonObject jo = new JsonObject();
+
+        jo.add(BLOCKCHAIN_PROTOCOL, blockchainProtocol.toJsonObject());
+
+        jo.add(HEIGHT, height);
+
+        jo.add(PREVIOUS_HASH, previousHash);
+        jo.add(TIMESTAMP, timeStamp);
+        jo.add(DIFFICULTY, difficultyTarget);
+        jo.add(DATA, new String(data));
+        jo.add(NONCE, nonce);
+
+        return jo;
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/core/BlockChainException.java

@@ -0,0 +1,35 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.core;
+
+import org.nanoboot.powerframework.core.PowerException;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class BlockChainException extends PowerException {
+    public BlockChainException(String msg) {
+        super(msg);
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/core/BlockchainEngine.java

@@ -0,0 +1,40 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.core;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public class BlockchainEngine {
+    @Getter
+    private final String protocolName;
+    private List<BlockchainEngineVersion> blockchainEngineVersionList = new ArrayList<>();
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/core/BlockchainEngineVersion.java

@@ -0,0 +1,54 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.core;
+
+import org.nanoboot.powerframework.blockchain.api.BlockSerializer;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public class BlockchainEngineVersion {
+    @Getter
+    private final String version;
+    @Getter
+    private final String hashCalculatorName;
+    @Getter
+    private final String targetDifficulty;
+    @Getter
+    private final BlockSerializer blockSerializer;
+    @Getter
+    private final long validFromBlock;
+    @Getter
+    private final long validUntilBlock;
+
+    public String getMayorVersion() {
+        return version.split(("\\."))[0];
+    }
+    public String getMinorVersion() {
+        return version.split(("\\."))[1];
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/core/BlockchainProtocol.java

@@ -0,0 +1,56 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.core;
+
+import org.nanoboot.powerframework.json.JsonObject;
+import org.nanoboot.powerframework.json.JsonObjectSerializable;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public class BlockchainProtocol implements JsonObjectSerializable {
+    private static final String PROTOCOL_NAME = "protocolName";
+    private static final String PROTOCOL_MAYOR_VERSION = "protocolMayorVersion";
+    private static final String PROTOCOL_MINOR_VERSION = "protocolMinorVersion";
+    @Getter
+    private final String protocolName;
+    @Getter
+    private final int protocolMayorVersion;
+    @Getter
+    private final int protocolMinorVersion;
+    @Override
+    public JsonObject toJsonObject() {
+
+        JsonObject jo = new JsonObject();
+
+        jo.add(PROTOCOL_NAME, protocolName);
+        jo.add(PROTOCOL_MAYOR_VERSION, protocolMayorVersion);
+        jo.add(PROTOCOL_MINOR_VERSION, protocolMinorVersion);
+
+        return jo;
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/impl/JsonBlockSerializer.java

@@ -0,0 +1,40 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.impl;
+
+import org.nanoboot.powerframework.blockchain.api.BlockSerializer;
+import org.nanoboot.powerframework.blockchain.core.Block;
+import org.nanoboot.powerframework.json.JsonObject;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class JsonBlockSerializer implements BlockSerializer {
+
+    @Override
+    public String serialize(Block block) {
+        JsonObject jsonObject = block.toJsonObject();
+        return jsonObject.toMinimalString();
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/impl/StringSerializer.java

@@ -0,0 +1,45 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.impl;
+
+import org.nanoboot.powerframework.blockchain.api.BlockSerializer;
+import org.nanoboot.powerframework.blockchain.core.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class StringSerializer implements BlockSerializer {
+
+    public static final String SEPARATOR = "::";
+
+    @Override
+    public String serialize(Block block) {
+        return block.getBlockchainProtocol().toString() + SEPARATOR +
+                block.getHeight() + SEPARATOR +
+                block.getPreviousHash() + SEPARATOR +
+                block.getTimeStamp() + SEPARATOR +
+                block.getDifficultyTarget() + SEPARATOR +
+                new String(block.getData()) + SEPARATOR +
+                block.getNonce();
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/api/BlockData.java

@@ -0,0 +1,31 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.api;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockData {
+    String convertToString();
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/api/BlockDeserializer.java

@@ -0,0 +1,33 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.api;
+
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockDeserializer {
+    Block deserialize(String serializedBlock);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/api/BlockMiner.java

@@ -0,0 +1,35 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.api;
+
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockFragment;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockType;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockMiner {
+    Block mine(BlockFragment blockFragment, BlockType blockType);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/api/BlockSerializer.java

@@ -0,0 +1,33 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.api;
+
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockSerializer {
+    String serialize(Block block);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/api/BlockValidator.java

@@ -0,0 +1,35 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.api;
+
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockType;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public interface BlockValidator {
+    BlockType getBlockType();
+    void validate(Block block);
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/Block.java

@@ -0,0 +1,117 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockData;
+import org.nanoboot.powerframework.blockchain.core.BlockChainException;
+import org.nanoboot.powerframework.json.JsonObject;
+import org.nanoboot.powerframework.json.JsonObjectSerializable;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class Block implements JsonObjectSerializable {
+    public static final String BLOCK_TYPE_ID = "blockTypeId";
+    public static final String BLOCK_HEADER = "blockHeader";
+    public static final String BLOCK_DATA = "blockData";
+    public static final String NONCE = "nonce";
+
+    @Getter
+    private BlockHeader blockHeader;
+
+    @Getter
+    private BlockData blockData;
+
+    private long nonce;
+
+    @Getter
+    private String hash;
+    @Getter
+    private boolean locked = false;
+
+    @Getter
+    private BlockType internalBlockType;
+
+    public Block(BlockHeader blockHeader, JsonObject additionBlockHeader, BlockData blockData) {
+        this.blockHeader = blockHeader;
+
+        this.blockData = blockData;
+    }
+
+    public void injectBlockType(BlockType blockType) {
+        this.internalBlockType = blockType;
+    }
+
+    public String calculateHashTest(long nonce) {
+        this.nonce = nonce;
+        String hashedSerializedBlock = internalCalculateHash();
+        this.nonce = 0;//todo
+        return hashedSerializedBlock;
+    }
+
+    private String internalCalculateHash() {
+        if (nonce == 0) {
+            throw new BlockChainException("Nonce cannot be zero.");
+        }
+        if (locked) {
+            throw new BlockChainException("This block is already locked. Cannot set nonce and calculate nonce.");
+        }
+
+        if (internalBlockType == null) {
+            throw new BlockChainException("internalBlockType was not injected.");
+        }
+        String serializedBlock = this.internalBlockType.getBlockSerializer().serialize(this);
+
+        String hashedSerializedBlock = this.internalBlockType.getHashCalculator().hash(serializedBlock);
+
+        //System.out.println("internalCalculateHash - hash for nonce " + nonce + " = " + hashedSerializedBlock);
+        return hashedSerializedBlock;
+    }
+
+    public void lock(long nonce) {
+        this.nonce = nonce;
+        String hashedSerializedBlock = internalCalculateHash();
+        this.hash = hashedSerializedBlock;
+
+        this.locked = true;
+    }
+
+    @Override
+    public JsonObject toJsonObject() {
+        if (nonce == 0) {
+            throw new BlockChainException("Nonce cannot be zero, if json object is created from this block instance.");
+        }
+        if (internalBlockType == null) {
+            throw new BlockChainException("internalBlockType was not injected.");
+        }
+        JsonObject jo = new JsonObject();
+        jo.add(BLOCK_TYPE_ID, internalBlockType.getBlockTypeId());
+        jo.add(BLOCK_HEADER, blockHeader.toJsonObject());
+
+        jo.add(BLOCK_DATA, blockData.convertToString());
+        jo.add(NONCE, nonce);
+        return jo;
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockChain.java

@@ -0,0 +1,100 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.blockchain.core.BlockChainException;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class BlockChain {
+    private String blockChainEngineName;
+    private List<Block> blocks = new ArrayList<>();
+
+    public int getTotalHeight() {
+        return blocks.size() - 1;
+    }
+
+    public boolean isEmpty() {
+        return blocks.isEmpty();
+    }
+
+    public Block getGenesisBlock() {
+        if (isEmpty()) {
+            return null;
+        }
+        return getBlock(0);
+    }
+
+    public Block getLastBlock() {
+        if (isEmpty()) {
+            return null;
+        }
+        return getBlock(blocks.size() - 1);
+    }
+
+    public List<Block> getLastXBlocks(int xCount) {
+        List<Block> result = new ArrayList<>();
+
+        if (isEmpty()) {
+            return result;
+        }
+        if (xCount <= blocks.size()) {
+            for (Block b : blocks) {
+                result.add(b);
+            }
+            return result;
+        }
+        for (int i = blocks.size() - xCount; i <= (blocks.size() - 1); i++) {
+            result.add(blocks.get(i));
+        }
+        return result;
+    }
+
+    public void addBlock(Block block) {
+        if (!block.isLocked()) {
+            throw new BlockChainException("Block is not locked. It cannot be added");
+        }
+        if (blocks.isEmpty() && block.getBlockHeader().getHeight() != 0) {
+            throw new BlockChainException("New block is a genesis block, but its height is not zero.");
+        }
+        Block lastBlock = getLastBlock();
+        String previousBlockHash = lastBlock == null ? "0" : lastBlock.getHash();
+
+        if (!block.getBlockHeader().getPreviousHash().equals(previousBlockHash)) {
+            throw new BlockChainException("Block previous hash is not equal to the hash of the previous block. It cannot be added to the blockchain.");
+        }
+        blocks.add(block);
+    }
+
+    public Block getBlock(int blockHeight) {
+        if (blockHeight >= blocks.size()) {
+            throw new BlockChainException("There is no block with height " + blockHeight);
+        }
+        return blocks.get(blockHeight);
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockChainEngine.java

@@ -0,0 +1,55 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.blockchain.core.BlockChainException;
+import lombok.AllArgsConstructor;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public abstract class BlockChainEngine {
+    private String blockChainEngineName;
+    protected BlockChain blockChain;
+    protected BlockTypeVersionList blockTypeVersionList;
+
+    public void addData(String data) {
+        BlockFragment blockFragment = createNewBlockFragment(data);
+        BlockType blockType = blockTypeVersionList.findBlockType(blockFragment.getBlockHeader().getBlockTypeId());
+        if (blockType == null) {
+            throw new BlockChainException("blockType " + blockFragment.getBlockHeader().getBlockTypeId() + " was not found.");
+        }
+
+        Block block = blockType.getBlockMiner().mine(blockFragment, blockType);
+        addBlock(block);
+    }
+
+    public abstract BlockFragment createNewBlockFragment(String data);
+
+    public void addBlock(Block newBlock) {
+        blockChain.addBlock(newBlock);
+    }
+
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockFragment.java

@@ -0,0 +1,42 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockData;
+import org.nanoboot.powerframework.json.JsonObject;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public class BlockFragment {
+    @Getter
+    private BlockHeader blockHeader;
+
+    @Getter
+    private BlockData blockData;
+
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockHeader.java

@@ -0,0 +1,60 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.json.JsonObject;
+import org.nanoboot.powerframework.json.JsonObjectSerializable;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+@AllArgsConstructor
+public class BlockHeader implements JsonObjectSerializable {
+    public static final String BLOCK_TYPE_ID = "blockTypeId";
+    public static final String HEIGHT = "height";
+    public static final String TIME_STAMP = "timeStamp";
+    public static final String PREVIOUS_HASH = "previousHash";
+    @Getter
+    private String blockTypeId;
+    @Getter
+    private int height;
+    @Getter
+    private long timeStamp;
+    @Getter
+    private String previousHash;
+    @Getter
+    private String difficulty;
+
+    public JsonObject toJsonObject() {
+        JsonObject jo = new JsonObject();
+        jo.add(BLOCK_TYPE_ID, blockTypeId);
+        jo.add(HEIGHT, height);
+        jo.add(TIME_STAMP, timeStamp);
+        jo.add(PREVIOUS_HASH, previousHash);
+        return jo;
+    }
+
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockType.java

@@ -0,0 +1,55 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockDeserializer;
+import org.nanoboot.powerframework.blockchain.orig.api.BlockMiner;
+import org.nanoboot.powerframework.blockchain.orig.api.BlockSerializer;
+import org.nanoboot.powerframework.security.hash.api.HashCalculator;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+@AllArgsConstructor
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class BlockType {
+    @Getter
+    private String type;
+    @Getter
+    private int mayorVersion;
+    @Getter
+    private int minorVersion;
+    @Getter
+    private HashCalculator hashCalculator;
+    @Getter
+    private BlockSerializer blockSerializer;
+    @Getter
+    private BlockDeserializer blockDeserializer;
+    @Getter
+    BlockMiner blockMiner;
+    public String getBlockTypeId() {
+        return type + ":" + mayorVersion + ":" + minorVersion;
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/base/BlockTypeVersionList.java

@@ -0,0 +1,47 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.base;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class BlockTypeVersionList {
+    private Map<String, BlockType> blockTypes;
+
+    public BlockTypeVersionList(List<BlockType> blockTypesList) {
+        blockTypes = new HashMap<>();
+        for (BlockType bt : blockTypesList) {
+            blockTypes.put(bt.getBlockTypeId(), bt);
+        }
+    }
+
+    public BlockType findBlockType(String blockTypeId) {
+        return blockTypes.get(blockTypeId);
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/cash/Transaction.java

@@ -0,0 +1,29 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.cash;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class Transaction {
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/cash/TransactionValidator.java

@@ -0,0 +1,29 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.cash;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class TransactionValidator {
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/cash/Wallet.java

@@ -0,0 +1,29 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.cash;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class Wallet {
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/core/Main.java

@@ -0,0 +1,48 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.core;
+
+import org.nanoboot.powerframework.blockchain.orig.base.BlockChain;
+import org.nanoboot.powerframework.blockchain.orig.impl.TestCash_BlockChainEngine;
+import org.nanoboot.powerframework.random.generators.linearcongruent.combined.w5.W5RandomGenerator;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class Main {
+    public static void main(String[] args) {
+//        HashCalculator.main(null);
+//
+//        if(true) return;
+        BlockChain blockChain = new BlockChain();
+        TestCash_BlockChainEngine bce = new TestCash_BlockChainEngine(blockChain);
+        bce.addData("ahoj");
+        bce.addData("pavle");
+        bce.addData("leo");
+        for(int i =0;i<100000000;i++){
+            bce.addData(W5RandomGenerator.getStaticInstance().nextText(8));
+        }
+
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/JsonBlockSerializer.java

@@ -0,0 +1,41 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockSerializer;
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+import org.nanoboot.powerframework.json.JsonObject;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+
+public class JsonBlockSerializer implements BlockSerializer {
+
+    @Override
+    public String serialize(Block block) {
+        JsonObject jsonObject = block.toJsonObject();
+        //System.out.println(jsonObject.toMinimalString());
+        return jsonObject.toMinimalString();
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/SimpleBlockData.java

@@ -0,0 +1,40 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockData;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+@AllArgsConstructor
+public class SimpleBlockData implements BlockData {
+    @Getter
+    private final String string;
+    @Override
+    public String convertToString() {
+        return string;
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/TestCash_1_0_Block.java

@@ -0,0 +1,36 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockData;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockHeader;
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class TestCash_1_0_Block extends Block {
+    public TestCash_1_0_Block(BlockHeader blockHeader, BlockData blockData) {
+        super(blockHeader, null, blockData);
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/TestCash_1_0_BlockMiner.java

@@ -0,0 +1,95 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.api.BlockMiner;
+import org.nanoboot.powerframework.blockchain.orig.base.Block;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockFragment;
+import org.nanoboot.powerframework.blockchain.orig.base.BlockType;
+import org.nanoboot.powerframework.blockchain.core.BlockChainException;
+import org.nanoboot.powerframework.security.hash.api.HashCalculator;
+import org.nanoboot.powerframework.time.duration.Duration;
+import org.nanoboot.powerframework.time.duration.StopWatch;
+import org.nanoboot.powerframework.time.utils.TimeUnit;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class TestCash_1_0_BlockMiner implements BlockMiner {
+    public static List<Integer> lastFiveBlockMiningTimesInMilliseconds = new ArrayList<>();
+
+    @Override
+    public Block mine(BlockFragment blockFragment, BlockType blockType) {
+
+        TestCash_1_0_Block block = new TestCash_1_0_Block(blockFragment.getBlockHeader(), blockFragment.getBlockData());
+        block.injectBlockType(blockType);
+
+        ////System.out.println("Starting mining block # " + block.getBlockHeader().getHeight());
+        //System.out.println("Note: One block should be mined in 1 minute, but the last time was " + countOfSecondsToMineLastBlock + " second(s).");
+        //System.out.println("Starting mining block # " + block.getBlockHeader().getHeight());
+        StopWatch sw = new StopWatch();
+
+        //System.out.println("start: " + UniversalDateTime.now().toString());
+        sw.start();
+
+        ////System.out.println("Searching hash equal or less than " + block.getBlockHeader().getDifficulty());
+        for (long nonce = 1; nonce <= Long.MAX_VALUE; nonce++) {
+            if (nonce == Integer.MAX_VALUE) {
+                throw new BlockChainException("Nonce was not found.");
+            }
+            if (nonce % 1000000 == 0) {
+                System.out.println("Nonce # " + nonce);
+            }
+
+
+            HashCalculator hashCalculator = block.getInternalBlockType().getHashCalculator();
+            String hash = block.calculateHashTest(nonce);
+            //System.err.println("hashCalculator.compareHexNumbers("+hash+"+, block.getBlockHeader().getDifficulty()="+block.getBlockHeader().getDifficulty()+")="+hashCalculator.compareHexNumbers(hash, block.getBlockHeader().getDifficulty()));
+            if (hashCalculator.compareHexNumbers(hash, block.getBlockHeader().getDifficulty()) <= 0) {
+
+                //System.err.println("hashCalculator.compareHexNumbers("+hash+"+, block.getBlockHeader().getDifficulty()="+block.getBlockHeader().getDifficulty()+")="+hashCalculator.compareHexNumbers(hash, block.getBlockHeader().getDifficulty()));
+                block.lock(nonce);
+                ////System.out.println("Found nonce: " + nonce + " A new block was just mined: " + block.getHash() + "\n" /*+ block.toJsonObject().toPrettyString()*/);
+
+                break;
+            }
+        }
+
+        //System.out.println("end: " + UniversalDateTime.now().toString());
+        sw.stop();
+        Duration lastDuration = sw.getCurrentDuration();
+        if (lastFiveBlockMiningTimesInMilliseconds.size() == 1000) {
+            lastFiveBlockMiningTimesInMilliseconds.remove(0);
+        }
+        lastFiveBlockMiningTimesInMilliseconds.add((int) lastDuration.toTotal(TimeUnit.MILLISECOND));
+        //countOfSecondsToMineLastBlock = (int) lastDuration.toTotal(TimeUnit.SECOND);
+        if (block.getBlockHeader().getHeight() % 100 == 0)
+            System.out.println("Mining block " + block.getBlockHeader().getHeight() + " + took " + lastDuration.toString() + " .");
+        return block;
+    }
+
+
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/TestCash_1_0_BlockType.java

@@ -0,0 +1,39 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.base.BlockType;
+import org.nanoboot.powerframework.security.hash.locator.HashCalculatorLocator;
+import org.nanoboot.powerframework.security.hash.locator.HashImpl;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class TestCash_1_0_BlockType extends BlockType {
+private static final String TYPE = "test_cash";
+private static final int MAYOR_VERSION = 1;
+private static final int MINOR_VERSION = 0;
+    public TestCash_1_0_BlockType() {
+        super(TYPE, MAYOR_VERSION, MINOR_VERSION, HashCalculatorLocator.locate(HashImpl.SHA_256), new JsonBlockSerializer(), null, new TestCash_1_0_BlockMiner());
+    }
+}

power-blockchain/src/main/java/org/nanoboot/powerframework/blockchain/orig/impl/TestCash_BlockChainEngine.java

@@ -0,0 +1,136 @@
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// power-framework: Java library with many purposes of usage.
+// Copyright (C) 2016-2022 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation;
+// version 2.1 of the License only.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+package org.nanoboot.powerframework.blockchain.orig.impl;
+
+import org.nanoboot.powerframework.blockchain.orig.base.*;
+import org.nanoboot.powerframework.security.hash.api.HashCalculator;
+import org.nanoboot.powerframework.time.duration.Duration;
+import org.nanoboot.powerframework.time.moment.UniversalDateTime;
+import org.nanoboot.powerframework.time.utils.TimeUnit;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+/**
+ * 
+ *
+ * @author <a href="mailto:robertvokac@nanoboot.org">Robert Vokac</a>
+ * @since 0.0.0
+ */
+public class TestCash_BlockChainEngine extends BlockChainEngine {
+
+    public static final String TEST_CASH = "TestCash";
+    public static final int COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK = 10;
+    //public static final String DEFAULT_DIFFICULTY = "0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";
+    public static final String DEFAULT_DIFFICULTY = "00184f329993e8d38cd0a31969b54367b4fc5af6ed86d827c1343dbf8b66a4a5";
+
+    public static float DIFFICULTY_PERCENT_CHANGE = (float) 1;
+
+    public TestCash_BlockChainEngine(BlockChain blockChain) {
+        super(TEST_CASH, blockChain, new BlockTypeVersionList(List.of(new TestCash_1_0_BlockType())));
+    }
+
+    @Override
+    public BlockFragment createNewBlockFragment(String data) {
+        Block lastBlock = blockChain.getLastBlock();
+        int newBlockHeight = lastBlock == null ? 0 : lastBlock.getBlockHeader().getHeight() + 1;
+        long newTimeStamp = UniversalDateTime.now().toLong();
+        String previousBlockHash = lastBlock == null ? "0" : lastBlock.getHash();
+        String oldDifficulty = lastBlock == null ? DEFAULT_DIFFICULTY : lastBlock.getBlockHeader().getDifficulty();
+        String newDifficulty = oldDifficulty;
+
+        int newDifficultyPeriod = 1000;
+        if (lastBlock != null && newBlockHeight % newDifficultyPeriod == 0) {
+
+            List<Block> lastBlocks = blockChain.getLastXBlocks(newDifficultyPeriod);
+            int lastBlocksCount = lastBlocks.size();
+            Block blockStart = lastBlocks.get(0);
+            Block blockEnd = lastBlocks.get(lastBlocks.size() - 1);
+            long moment1 = blockStart.getBlockHeader().getTimeStamp();
+            long moment2 = blockEnd.getBlockHeader().getTimeStamp();
+            UniversalDateTime udt1 = new UniversalDateTime(moment1);
+            UniversalDateTime udt2 = new UniversalDateTime(moment2);
+            Duration duration = new org.nanoboot.powerframework.time.duration.Period(udt1, udt2).getDuration();
+            duration.toTotal(TimeUnit.SECOND);
+            double averageCountOfMillisecondsToMineABlockForTenLastBlocks = (duration.toTotal(TimeUnit.SECOND) / (lastBlocksCount - 1));
+
+            int countX = 0;
+            int sum = 0;
+            for (Integer i : TestCash_1_0_BlockMiner.lastFiveBlockMiningTimesInMilliseconds) {
+                sum = sum + i;
+                countX = countX + 1;
+            }
+            System.out.println("sumInSeconds="+((double)sum));
+
+            averageCountOfMillisecondsToMineABlockForTenLastBlocks =  ((((double) sum) / ((double) countX)) /*/ 1*/);
+            System.out.println("averageCountOfMillisecondsToMineABlockForTenLastBlocks=" + averageCountOfMillisecondsToMineABlockForTenLastBlocks);
+            boolean plus = false;
+            if(((int)Math.round(averageCountOfMillisecondsToMineABlockForTenLastBlocks))==COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK) {
+                DIFFICULTY_PERCENT_CHANGE=1f/16;
+            } else {
+                if(DIFFICULTY_PERCENT_CHANGE != (float) 1f/1f) {
+                    DIFFICULTY_PERCENT_CHANGE = (float) 1f/1f;
+                }
+            }
+            if (averageCountOfMillisecondsToMineABlockForTenLastBlocks < COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK) {
+                plus = false;
+                System.out.println("Difficulty +++ increasing");
+
+            }
+            if (averageCountOfMillisecondsToMineABlockForTenLastBlocks > COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK) {
+                plus = true;
+                System.out.println("Difficulty --- decreasing");
+            }
+//            if (DIFFICULTY_PERCENT_CHANGE >= 16) {
+//                DIFFICULTY_PERCENT_CHANGE = 4;
+//            }
+
+            System.out.println("averageCountOfSecondsToMineABlockForTenLastBlocks=" + averageCountOfMillisecondsToMineABlockForTenLastBlocks);
+            if (averageCountOfMillisecondsToMineABlockForTenLastBlocks != COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK) {
+                //DIFFICULTY_PERCENT_CHANGE = DIFFICULTY_PERCENT_CHANGE * 2;
+                double realDifficultyPercentChange = DIFFICULTY_PERCENT_CHANGE;
+                double more = averageCountOfMillisecondsToMineABlockForTenLastBlocks > COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK ? averageCountOfMillisecondsToMineABlockForTenLastBlocks : COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK;
+                double less = averageCountOfMillisecondsToMineABlockForTenLastBlocks < COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK ? averageCountOfMillisecondsToMineABlockForTenLastBlocks : COUNT_OF_MILLISECONDS_TO_MINE_A_BLOCK;
+
+                if ((less / more) < 0.5) {
+                    realDifficultyPercentChange = 50;
+                }
+                double change = 1 + ((plus ? 1 : (-1)) * (realDifficultyPercentChange / 100));
+//                if((double)(averageCountOfSecondsToMineABlockForTenLastBlocks) / (double)(COUNT_OF_SECONDS_TO_MINE_A_BLOCK)<0.9 || (double)(averageCountOfSecondsToMineABlockForTenLastBlocks) / (double)(COUNT_OF_SECONDS_TO_MINE_A_BLOCK)> 1.1){
+//                    change = 1 + ((plus ? 1 : (-1)) * (25f / 100));
+//                }
+                System.out.println(" Changing to " + change);
+                BlockType blockType = blockTypeVersionList.findBlockType("test_cash:1:0");
+                HashCalculator hashCalculator = blockType.getHashCalculator();
+                String oldDifficultyAsDec = hashCalculator.convertHexStringToDecString(oldDifficulty);
+                System.out.println("oldDifficultyAsDec=" + oldDifficultyAsDec);
+                BigInteger bi = new BigDecimal(oldDifficultyAsDec).multiply(new BigDecimal(change)).toBigInteger();
+                System.out.println("newDifficultyAsDec=" + bi.toString());
+                newDifficulty = hashCalculator.convertDecStringToHexString(bi.toString());
+                System.err.println("NEW_DIFFICULTY = "  + newDifficulty);
+            } else {
+                //DIFFICULTY_PERCENT_CHANGE = DIFFICULTY_PERCENT_CHANGE / 2;
+            }
+        }
+        BlockHeader blockHeader = new BlockHeader("test_cash:1:0", newBlockHeight, newTimeStamp, previousBlockHash, newDifficulty);
+        return new BlockFragment(blockHeader, new SimpleBlockData(data));
+    }
+}