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I create go bindings for my smart contract but have an issue when executing a transaction. It only works when I explicitly specify the txOpts.Nonce (see commented line). When I leave the line commented I get this error: 

Failed to execute transaction: failed to retrieve account nonce: json: cannot unmarshal hex number with leading zero digits into Go value of type hexutil.Uint64`

Here is the relevant code:

txOpts := bind.NewKeyedTransactor(key)

//txOpts.Nonce = big.NewInt(<nonce>)

tx, err := token.MyContract(txOpts, big.NewInt(1))
if err != nil {
    log.Fatalf("Failed to execute transaction: %v", err)
}

The documentation tells it would retrieve the pending nonce from txOpts.From when txOpts.Nonce is nil.

Sebastian
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1 Answers1

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For anyone else wondering about this, I encountered this error while testing with the Truffle develop framework. For me, this problem was because the Truffle JSON-RPC server was returning hex values with leading zeros like "0x04", which violates the spec here:

https://github.com/ethereum/wiki/wiki/JSON-RPC#hex-value-encoding

When encoding QUANTITIES (integers, numbers): encode as hex, prefix with "0x", the most compact representation (slight exception: zero should be represented as "0x0").

WRONG: 0x0400 (no leading zeroes allowed)

That said, for Truffle, there's already a pull request here: https://github.com/trufflesuite/ganache-core/pull/32

If you're using another JSON-RPC server, you'd have to verify for yourself that it's actually following this spec.

Community
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