我已经使用arraylist容器对象(块类)在java中实现了一个简单的区块链。
public static ArrayList<Block> blockchain = new ArrayList<Block>();
..。和block类,包含我需要存储到区块链中的事务。
public Block(transaction data,String previousHash ) {
this.data = data;
this.previousHash = previousHash;
this.timeStamp = new Dat
在智能契约函数本身内,是否有可能获得事务的状态,比如如果它通过罚款或任何失败。让我说,我正试图将一些以太转移到另一个地址,并想知道Tx是否成功。
address payable to = external_address;
uint256 amount = _amount;
to.transfer(amount);
//wait for the Tx to complete, then update the status as done
有没有办法知道转会是否顺利?
谢谢
有谁能详细解释一下:
why solving a crypto puzzle by blockchain nodes is key in blockchain systems?
What factor can make a node solve the puzzle earlier than others.
How is it important for security in blockchain system?