區塊鏈本質上是一種有序，反向連結連結串列的資料結構。block按照插入的順序存放，同時每個block都儲存指向一個儲存連結。這種結構保證可以快速獲取最新插入的block同時獲取他的hash值，而且很高效。

public class Blockchain

{

private List <Block>blockList;

public Blockchain List<Block>blockList;

this.blockList=blockList;

}

public void addBlock(String data)

{

Block previousBlock=blockList.get(blockList.size()-1);

this.addBlock(Block.newBlock(previousBlock.getHash() ,data) );

}

public void addBlock(Block block)

{

this.blockList.add(block);

}

public static Block newGenesisBlock()

{

return Block.newBlock(" ","Genesis Block");

}

public static Blockchain newBlockchain()

{

List<Block>blocks=new linkedList<>();

blocks.add(Block.newGenesisBlock());

return new Blockchain(blocks);

}