erc20 智能合约各方法对应的签名编码（transfer / 0xa9059cbb）

erc20智能合约常见方法对应的签名编码：

常见例如：transfer(address,uint256)

编码为：web3.sha3("transfer(address,uint256)").substring(0,10)  -> "0xa9059cbb"

balanceOf(address)

编码为：web3.sha3("balanceOf(address)").substring(0,10)  -> "0x70a08231"

transfer(address,uint256)： 0xa9059cbb

balanceOf(address)：0x70a08231

decimals()：0x313ce567

allowance(address,address)： 0xdd62ed3e

symbol()：0x95d89b41

totalSupply()：0x18160ddd

name()：0x06fdde03

approve(address,uint256)：0x095ea7b3

transferFrom(address,address,uint256)： 0x23b872dd

参考：

http://ethercontracts.info/contract/670a27c4d146ff2f88a427838f1fddb487cfa7cb

https://www.bokconsulting.com.au/blog/assessing-the-erc20-token-exchange-withdrawal-bug-exploit/