Transaction hashes and block hash missing in JSON response

FralgoJun 21, 2022

I am trying to retrieve Algorand transactions using the v2/blocks/{round} endpoint, but the JSON response does not contain any transaction or block hashes. Is there any way to construct these using the data in the response without using the SDKs?

scholtzLudo, Everyday AlgonautJun 21, 2022

Check this out: vote-coin-indexer/computeTransactionId.ts at master · scholtz/vote-coin-indexer · GitHub

github.com

scholtz/vote-coin-indexer/blob/4bb4c9c83021bd29152a44b9168c9ca561093bd3/src/app.ts#L59

      
        
            //console.log('block.block', block.block);
            if (block.block.txns) {
              let countProcessedTxns = 0;
              //console.log('block.block.txns', block.block.txns.length);
              for (const stxn of block.block.txns) {
                countProcessedTxns++;
                try {
                  if (!stxn.txn.note) continue;
                  const note = Buffer.from(stxn.txn.note).toString('utf-8');
                  if (!note.startsWith('avote-')) continue;
                  const txId = computeTransactionId(block.block.gh, block.block.gen, stxn);
                  const pos = note.indexOf(':');
                  let messageType = note.substring(0, pos);
                  const posSlash = note.indexOf('/');
                  const posSlash2 = note.indexOf('/', posSlash + 1);
                  if (posSlash2 > 0) {
                    messageType = messageType.substring(0, posSlash2);
                  }
                  //console.log('posSlash2', posSlash2);
                  const dataStr = note.substring(pos + 2);
                  //console.log(dataStr)

fabriceFabrice BenhamoudaJun 21, 2022

Another solution is to query the indexer rather than the algod endpoint.
The indexer computes the transaction ID for you.

FralgoJun 22, 2022

Unfortunately, the indexer only seems to give the previous block hash and not the current one so that doesn’t solve every issue.

fabriceFabrice BenhamoudaJun 22, 2022

I read too fast, I thought you meant transaction ID for some reason.

You can get the current block hash as shown there: