Duplicate Transactions Blocked When Using Identical Parameters from wallet/getblock Within the Same Block

[web3bon]

When constructing transactions locally using TronWeb, the block parameters (e.g., block number, block timestamp, etc.) are fetched via the wallet/getblock endpoint. These parameters remain constant within the same block. As a result, if multiple transactions are constructed with identical parameters within the same block (e.g., within the same second), the second transaction is considered a duplicate and cannot be broadcast.

Expected Behavior:
Multiple transactions constructed in quick succession should be assigned unique or sufficiently differentiated parameters to allow them to be submitted within the same block.

Actual Behavior:
Transactions constructed with the same block reference and identical input are treated as duplicates, preventing the second transaction from being accepted or broadcasted.

Steps to Reproduce:

Use TronWeb to construct a transaction using parameters from wallet/getblock.

Immediately construct a second transaction with the same inputs and parameters.

Attempt to broadcast both transactions.

Observe that the second transaction is rejected or ignored.

Suggestion:
Introduce a mechanism in TronWeb to:

Fetch fresh block references if needed.

Allow setting custom or updated transaction parameters.

Include a nonce-like mechanism or unique salt to differentiate transactions created within the same block.

[xdorxd]

I found a solution in https://tronweb.network/docu/docs/5.3.2/Release%20Note#new-features. You can use your own blockHeader when constructing a transaction.

[Stan202310]

If you want to broadcast 2 identical transactions, you can use custom block header as @xdorxd mentioned.
Here's an example:

const blockInfo = await tronWeb.trx.getCurrentBlock();
const blockHeader1 = {
    ref_block_bytes: blockInfo.block_header.raw_data.number.toString(16).slice(-4).padStart(4, '0'),
    ref_block_hash: blockInfo.blockID.slice(16, 32),
    expiration: blockInfo.block_header.raw_data.timestamp + 60 * 1000,
    timestamp: blockInfo.block_header.raw_data.timestamp,
}
const tx1 = tronWeb.transactionBuilder.sendTrx('TS7pha3r3WzzBo95nY1Y9oL5ahVDFeB2Yh', 1e6, tronWeb.defaultAddress.base58, {
    blockHeader: blockHeader1,
});
const blockHeader2 = {
    ref_block_bytes: blockInfo.block_header.raw_data.number.toString(16).slice(-4).padStart(4, '0'),
    ref_block_hash: blockInfo.blockID.slice(16, 32),
    expiration: blockInfo.block_header.raw_data.timestamp + 60 * 1000,
    timestamp: blockInfo.block_header.raw_data.timestamp + 1,
}
const tx2 = tronWeb.transactionBuilder.sendTrx('TS7pha3r3WzzBo95nY1Y9oL5ahVDFeB2Yh', 1e6, tronWeb.defaultAddress.base58, {
    blockHeader: blockHeader2,
});

The main step is to change timestamp. But you can change any field in blockHeader as long as the parameters are valid.

[Nicholas090]

Solved in PR

[vlad1300]

Поясніть що за айл