ssaurel

// Method for comparing two strings and returning true if they have same letters
public static boolean sameLetters(String a, String b) {
 if (a == null)
  return b == null;
 if (b == null)
  return false;

 char[] left = a.toCharArray();
 char[] right = b.toCharArray();

ssaurel

// Method for loading words from assets
public static void loadWords(Context context) {
 BufferedReader buf = null;

 try {
  buf = new BufferedReader(new InputStreamReader(context.getAssets().open(DICT)));

  String line = null;

  // we read file line by line to store words

ssaurel

var blockchain = new Blockchain(4);
var block1 = blockchain.newBlock("Second Block");
blockchain.addBlock(block1);
var block2 = blockchain.newBlock("Third Block");
blockchain.addBlock(block2);
var block3 = blockchain.newBlock("Fourth Block");
blockchain.addBlock(block3);

console.log("Blockchain Validity: " + blockchain.isBlockchainValid());

ssaurel

 var blockchain = new Blockchain(4);
 var block1 = blockchain.newBlock("Second Block");
 blockchain.addBlock(block1);
 var block2 = blockchain.newBlock("Third Block");
 blockchain.addBlock(block2);
 var block3 = blockchain.newBlock("Fourth Block");
 blockchain.addBlock(block3);

 console.log("Blockchain Validity: " + blockchain.isBlockchainValid());

ssaurel

class Blockchain {
 constructor(difficulty) {
    this.difficulty = difficulty;
    this.blocks = [];
    // Add Genesis Block
    var genesisBlock = new Block(0, null, Date.now(), "Genesis block");
    genesisBlock.mineBlock(this.difficulty);
    this.blocks.push(genesisBlock);
 }
}

ssaurel

class Blockchain {
 constructor(difficulty) {
    this.difficulty = difficulty;
    this.blocks = [];
    // Add Genesis Block
    var genesisBlock = new Block(0, null, Date.now(), "Genesis block");
    genesisBlock.mineBlock(this.difficulty);
    this.blocks.push(genesisBlock);
 }
}

ssaurel

class Blockchain {
 constructor(difficulty) {
    this.difficulty = difficulty;
    this.blocks = [];
 }
}

ssaurel

Block.prototype.mineBlock = function(difficulty) {
 this.nonce = 0;
 var zeros = "0".repeat(difficulty);

 while (this.hash.substring(0, difficulty) != zeros) {
   this.nonce++;
   this.hash = calculateHash(this);
 }

};

ssaurel

function calculateHash(block) {
  return sha256(block.index + block.previousHash + 
         block.timestamp + block.data + 
         block.nonce);
}

ssaurel

class Block {
 constructor(index, previousHash, timestamp, data) {
   this.index = index;
   this.previousHash = previousHash;
   this.timestamp = timestamp;
   this.data = data;
   this.nonce = 0;
   this.hash = calculateHash(this); // defined later
 }
}