返回TRON chainId，TRON chainId为创世块哈希的最后四个字节
参数
无参数
返回值
DATA - TRON chainId
示例
curl -X POST 'https://api.shasta.trongrid.io/jsonrpc' --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":79}'
结果
{"jsonrpc":"2.0","id":79,"result":"0x2b6653dc"}