let blockNumber = "1"
let amount = "5"
let address = "0x4d90A916Af517dccb3cAC1A0e2c333D47eF224E85722"
let dataToEncode = [address, amount, blockNumber]
let token_id = ethUtil.sha3(dataToEncode).toString('hex')
// d9964d90a916af517dfcb3cbc1a0e2c322d47ef224e857223531