[Ethereum] How to know if a transaction went through or not? (out of gas)


Apparently when sending transactions from an Account instead of a Wallet, the gas spent is small (21K), and not enough to send ether to a Contract Wallet (out of gas, so to speak).

When this happens, the transaction shouldn't go through (or be cancelled, as it says here), however it seems to still be recorded in the blockchain, why? Example.

Doesn't etherscan.io provide any clue about if the transaction ended up being valid or not? In this case it should be marked as CANCELLED/INVALID in that URL, as far as I understand.

Best Answer

Using etherscan blockchain explorer

In etherscan, look for the TxReceipt Status which will have Fail in red, or Success in green.

Example of a failure: https://ropsten.etherscan.io/tx/0x67a5f6442f49a5da6ff8682250a8eef899d9dc0c5adf20b683709433902b5956

Using the receipt

eth.getTransactionReceipt(transactionHash) will return a status field that has a value of 0 when a transaction has failed and 1 when the transaction has succeeded.

Here's an example showing the status field:

{ blockHash: '0xb1fcff633029ee18ab6482b58ff8b6e95dd7c82a954c852157152a7a6d32785e',
  blockNumber: 4370000,
  contractAddress: null,
  cumulativeGasUsed: 21000,
  gasUsed: 21000,
  logs: [],
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  root: null,
  status: 1, // **** HERE IS THE STATUS FIELD *****
  transactionHash: '0x1421a887a02301ae127bf2cd4c006116053c9dc4a255e69ea403a2d77c346cf5',
  transactionIndex: 0 }

More details here.


To see if a transaction ran out of gas, you can input the transaction (hash) in https://live.ether.camp and then click on "VM Trace". (For the testnet Morden, use https://morden.ether.camp)

Or plug in the transactionHash in this url:


For the transaction mentioned in the question, 022f440fa96eb469363804d7b6c52321d4f409fa76578cdbdc5f04ff494b1321

here is the output https://live.ether.camp/transaction/022f440fa96eb469363804d7b6c52321d4f409fa76578cdbdc5f04ff494b1321/vmtrace#0

enter image description here

This transaction was out of gas immediately. Some transactions may run out of gas after doing some computations, and clicking on the Operations will show each step being performed and when the out of gas happens.