How can I find out the number of times an RSK transaction has been confirmed on the RSK blockchain?

Question

It would be good to know how many times a transaction has been confirmed on the RSK blockchain so that when one user sends RIF to another wallet or to an exchange wallet for example we can see how many confirmations have occurred

score 10 · Answer 1 · edited Feb 09 '21 at 11:32

Transactions do not have a confirmation count per se, but the blocks that they are a part of do indeed have confirmation counts. Thus, the solution lies in "comparing" the block number of a particular transaction.

Using curl

There are several ways to do this, and the easiest method is the eth_getTransactionByHash JSON-RPC method:

curl \
  -X POST \
  -H "Content-Type:application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0xf1ebb8076ad289fbaef4406bb0488be0c5605a58cfa2a6d11540b1f9b0d7ef98"],"id":1}' \
  https://public-node.testnet.rsk.co

The above cURL command is for transaction 0xf1ebb8076ad289fbaef4406bb0488be0c5605a58cfa2a6d11540b1f9b0d7ef98 on the RSK Testnet. The response is copied below:

{
   "result" : {
      "input" : "0xcbf8...(redacted)",
      "nonce" : "0xda62",
      "blockNumber" : "0x17fe5c",
      "gasPrice" : "0x3938700",
      "hash" : "0xf1ebb8076ad289fbaef4406bb0488be0c5605a58cfa2a6d11540b1f9b0d7ef98",
      "blockHash" : "0xede9aa2ff4939482186d4e6bd269582352a923db13ef90ad7def0d0dec17a239",
      "r" : "0x8c98a16250d157db1fb11e1304684943796710e3f1292a4fb60a0711692f2b8f",
      "value" : "0x0",
      "s" : "0x49cdc35f66dbea2ba88e3c52dc3f4c68498b844dd79eebafc326803e7163f7fc",
      "transactionIndex" : "0x0",
      "gas" : "0x17c65",
      "from" : "0xd761cc1ceb991631d431f6dde54f07828f2e61d2",
      "to" : "0x8bf2f24afbb9dbe4f2a54fd72748fc797bb91f81",
      "v" : "0x1c"
   },
   "jsonrpc" : "2.0",
   "id" : 1
}

From "blockNumber" : "0x17fe5c" we know that the block number of this particular block is 1572444.

The next step is to compare this block number of this transaction to the latest block number. To do so, we need to use a different JSON-RPC request.

curl \
  -X POST \
  -H "Content-Type:application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' \
  https://public-node.testnet.rsk.co

{
   "id" : 1,
   "result" : "0x180208",
   "jsonrpc" : "2.0"
}

From "result" : "0x180208" we know that the block number of the most recent block is 1573384.

node -e "console.log(0x180208 - 0x17fe5c);"
940

We subtract the transaction's block number from the latest block number, which yields the answer: 940 in this case - the number of confirmations.

Using web3

You can do the same using web3 (different hash in the example, mainnet):

web3.eth.getTransaction("0x9117f2fab63c89676b6538a317d0b9ec74cc4ac8f375c80c0f2b57223cbd6bb2")

{ hash: '0x9117f2fab63c89676b6538a317d0b9ec74cc4ac8f375c80c0f2b57223cbd6bb2',
  nonce: 118329,
  blockHash: '0x02c40394a7ed66bc50a0f1853220a395efd1e3cfebea5e0ff36dd5a0a12b2aeb',
  blockNumber: 3089723,
  transactionIndex: 1,
  from: '0x64DCC3BCbeaE8ce586CaBDef79104986bEAFcaD6',
  to: '0xBEd51D83CC4676660e3fc3819dfAD8238549B975',
  gas: 2000000,
  gasPrice: '60000000',
  value: '0',
  input: '0x5a686699000000000000000000000000000000000000000000000000032d5284006bf8730000000000000000000000000000000000000000000000000000000060214e2a000000000000000000000000504efcadfb020d6bbaec8a5c5bb21453719d0e00',
  v: '0x1b',
  r: '0x2faaa315b1b3cd7421db1dc5fa243ddfae906282872c2bd9207e7e2dfed8286e',
  s: '0x571fa5a28a48755bdf93aacd28d8d7d8986b1e2db0f5450e2355e7f3c91db30b' }

In this case, you get 3089723 from blockNumber

Now, you query the current best block:

web3.eth.getBlockNumber(console.log)

And, therefore, you have 3089747 - 3089723 = 24 confirmations.

score 7 · Accepted Answer · answered Feb 08 '21 at 16:52

You can also do it with web3.js. As function

const getTxConfirmations = (txHash) => Promise.all([
    web3.eth.getTransaction(txHash).then(tx => tx.blockNumber),
    web3.eth.getBlockNumber()
]).then(([blockNumber, currentBlockNumber]) => (currentBlockNumber - blockNumber))

And with Truffle console:

truffle(develop)> web3.eth.getTransaction('0x7a28a121c41085ef52d449f64120dbc422ec70b4d324c076c8d89222cf7188c8').then(tx => tx.blockNumber)
1
truffle(develop)> web3.eth.getBlockNumber()
5
truffle(develop)> const getTxConfirmations = (txHash) => Promise.all([web3.eth.getTransaction(txHash).then(tx => tx.blockNumber), web3.eth.getBlockNumber()]).then(([blockNumber, currentBlockNumber]) => (currentBlockNumber - blockNumber))
undefined
truffle(develop)> getTxConfirmations('0x7a28a121c41085ef52d449f64120dbc422ec70b4d324c076c8d89222cf7188c8')
4

score 6 · Answer 3 · edited Feb 03 '21 at 11:35

6

I am not sure if my response will be the best, but this is an option do find it.

I usually search in the explorer.rsk.co

First you can check the block number which your transaction was mined
After you can view the last block mined.
The difference between the block numbers is the number of confirmations

I hope it is useful to you :)

edited Feb 03 '21 at 11:35

bguiz

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answered Feb 02 '21 at 04:59

Solange Gueiros

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score 4 · Answer 4 · answered Feb 09 '21 at 03:40