ERC20 交易记录分析

ERC20代币的转账交易不是ETH的交易结构，那么如何从eth链中得到ERC20的交易信息呢？

ERC20转账后Transaction的记录是这样的：

{ hash: '0x023692023a0068a751fcee1c417c966f74e8a19f263af60898e53d55376b9ff2',
  nonce: 13,
  blockHash: '0xcc66c0d6e0e06cbb49bb418a2a6ca1f00caf747b9f4b9823ba40155b2c2bb531',
  blockNumber: 14,
  transactionIndex: 0,
  from: '0xc4cbe50fc291e3b7eebd83012658aeb41df1dd8d',
  to: '0xa8a3fdda4b017d09a5226e5f2f9f0fcdba394898',
  value: BigNumber { s: 1, e: 0, c: [ 0 ] },
  gas: 100000,
  gasPrice: BigNumber { s: 1, e: 0, c: [ 1 ] },
  input: '0xa9059cbb000000000000000000000000c0bdcba12c1cdf1d2afe2bf5ec5533b03a3c332d0000000000000000000000000000000000000000000000000000000000000017' }

value是0，不能据此得到ERC20交易信息。

需要用到 TransactionReceipt，代码：

var transaction = web3.eth.getTransactionReceipt("0x023692023a0068a751fcee1c417c966f74e8a19f263af60898e53d55376b9ff2");

console.log(transaction);

结果：

{ transactionHash: '0x023692023a0068a751fcee1c417c966f74e8a19f263af60898e53d55376b9ff2',
  transactionIndex: 0,
  blockHash: '0xcc66c0d6e0e06cbb49bb418a2a6ca1f00caf747b9f4b9823ba40155b2c2bb531',
  blockNumber: 14,
  gasUsed: 36569,
  cumulativeGasUsed: 36569,
  contractAddress: null,
  logs:
   [ { logIndex: 0,
       transactionIndex: 0,
       transactionHash: '0x023692023a0068a751fcee1c417c966f74e8a19f263af60898e53d55376b9ff2',
       blockHash: '0xcc66c0d6e0e06cbb49bb418a2a6ca1f00caf747b9f4b9823ba40155b2c2bb531',
       blockNumber: 14,
       address: '0xa8a3fdda4b017d09a5226e5f2f9f0fcdba394898',
       data: '0x0000000000000000000000000000000000000000000000000000000000000017',
       topics: [Array],
       type: 'mined' } ],
  status: '0x1',
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000200000000000000000000000000000000008000000000010000000000000000000000040000000000000000000000000000000000000000000000000000000000410000000000000000000000000000000000000000008000000000000000000000000000000000000002000000000000000000000000000000000000000000000000002000000000002000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000' }

其中的logs是关键，重点看一下：

[ { logIndex: 0,
    transactionIndex: 0,
    transactionHash: '0x023692023a0068a751fcee1c417c966f74e8a19f263af60898e53d55376b9ff2',
    blockHash: '0xcc66c0d6e0e06cbb49bb418a2a6ca1f00caf747b9f4b9823ba40155b2c2bb531',
    blockNumber: 14,
    address: '0xa8a3fdda4b017d09a5226e5f2f9f0fcdba394898',
    data: '0x0000000000000000000000000000000000000000000000000000000000000017',
    topics:
     [ '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef',
       '0x000000000000000000000000c4cbe50fc291e3b7eebd83012658aeb41df1dd8d',
       '0x000000000000000000000000c0bdcba12c1cdf1d2afe2bf5ec5533b03a3c332d' ],
    type: 'mined' } ]

address 是合约ID。

data 是交易额。

topics 包含了我们关注的信息：

• topics[0] - 事件的keccka的hash
• topics[1] - from 地址
• topics[2] - to 地址

这样就可以从链上得到某个ERC20代币的交易记录了。