Can't call contract with uint256 as a parameter

[Kastamarov]

I have a contract with this part off ABI:

[
{
      "constant": true,
      "inputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "name": "btcTransactions",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    }
] 

The contract can be found in the rinkeby test network on the address 0xf941b2f00aedd0bd8b98642a6e8232ccf02efd50.

Using the truffle I can easy call this function with a string or a BigNumber as a parameter, for example:
(rinkeby)>ICO.at("0xf941b2f00aedd0bd8b98642a6e8232ccf02efd50").btcTransactions("0x9d8336ca0217be46aba738cf09c429086398f0432420c8fe391a9d2ee18319a8");
false

(rinkeby)>ICO.at("0xf941b2f00aedd0bd8b98642a6e8232ccf02efd50").btcTransactions(web3.toBigNumber("0x9d8336ca0217be46aba738cf09c429086398f0432420c8fe391a9d2ee18319a8"));
false

But when i try to do the same thing using ethers.js I get the error:

Error: call exception (address="0xf941b2f00aedd0bd8b98642a6e8232ccf02efd50", method="btcTransactions(uint256)", value=[{"_bn":"9d8336ca0217be46aba738cf09c429086398f0432420c8fe391a9d2ee18319a8"}])
at Object.throwError (node_modules/ethers/utils/errors.js:74:17)

I've tried different ways to resolve this:

• contract.btcTransactions("hash");
• contract.btcTransactions(toUtf8Bytes("hash"));
• contract.btcTransactions(bigNumberify("hash"));
• contract.btcTransactions(bigNumberify(toUtf8Bytes("hash"))).

but it didn't help.

Thanks.

[ricmoo]

Are you sure you are using a Rinkeby provider? Is there any reason the method would throw? Call exception means the response from the network was empty...

[Kastamarov]

Yes, I'm sure, because I can easily call any other method from the contract using ethers.js

[ricmoo]

we are looking into this now. My partner has been trying it out.

Is it possible to get the source code? No worries if not.

[akucheruk-vareger]

I’m working on this either.
There are no reason the method would throw:

mapping (uint256 => bool) public btcTransactions;

I’ll try to prepare a snippet of code(but may be won’t be able to do this today).
Thank you for your help!

[ricmoo]

I think you may have a typo in your ABI or you are targeting an old version of your contract?

Looking at the code on the blockchain there is no method jump destination in the EVM bytecode for 0xbce71fc0, which is the signature for btcTransactions(uint256).

The fact that truffle returns false, is an issue with Web3; it treats exceptions as the default zero value for the type. Try using a value that should return false in Truffle, and I suspect it will also return false.

Let me know if you can verify this.

[akucheruk-vareger]

I feel you are deadly right.
We have a number of deployments for this contract and accidentally can use a one without this mapping, but trust truffle when check this issue.
I’ll try tomorrow when get to my laptop but I think you are right, especially if there are no signature in the bytecode
why I didn’t try to look there... arrgh :(
Sorry for that and many thanks!

[Kastamarov]

Thanks!