How can I decode getData from a contract method call

Question

I'm using myContractInstance.myMethod.getData() to be able to serialize a transaction:

// Get the call data, so you can call the contract through some other means
var myCallData = myContractInstance.myMethod.getData(param1 [, param2, ...]);
// myCallData = '0x45ff3ff6000000000004545345345345..'

The transaction is later excuted later (by another person):

web3.eth.sendTransaction({"data": myCallData});

However, I want the other person, who will execute the transaction, to be able to decode myCallData, so they know that they're not transfering a huge amount. I can't find a way to do that in the documentation, however.

Is there a friendly way to decode myCallData, and make it readable again for the user (other than breaking up the data ABI pieces myself)?

Peter.

Answer 1

The Ether value of the transaction is not part of this .getData(), it has to be set separately: web3.eth.sendTransaction({"data": myCallData, "value": 123});

On a different note, the user will need to trust the decoding tool. So why not offer a way for the user to replay this .getData() and confirm the byte-wise equality?