Combining Two Bitcoin Script Batches (PSBTS) While Retaining Existing Signatures
Bitcoin is a decentralized digital currency that uses blockchain technology to face facilitate peer-to-peer transactions without the need for intermediaries. One of its key features is the ability to execute multiple transactions. In this article,
What are psbts?
PSBT is a bitcoin script that contains one or more signed and unsigned transaction inputs and outputs. It is created by a node on the Bitcoin Network using a set of instructions encoded in a series of byte arrays, known as script bytes.
Combining Two PSBTS:
When combining two psbts, we need to ensure that the combined output still contains all the required signatures for the existing inputs. This can be achieved by creating a new batch (PSBT) with both input and output transactions. Here is an example of how this can be done:
`json
// Alice’s Private Key: “0x1234567890abcdef”
Const aliceprivatekey = ‘0x1234567890abcdef’;
Const combinedInput = [1, 2]; // Input Transaction IDs
Const combinedoutput = [3, 4, 5]; // Output Transaction IDS
// Create a New Batch (PSBT) With Both Input and Output Transactions
Const combinedSbt = {
Inputs: [
{ScriptSig: …},
{ScriptPubkey: …},
…, // Add More Inputs As Needed
],
Outputs: […], // Initialize Empty List for Outputs
Mempool: {}, // SET MEMPOOL TO AN EMPTY OBJECT
};
// Sign The New Batch (PSBT) With Alice’s Private Key
synst signedbatch = combineinputs (aliceprivatekey, combinedInput, combinedoutput);
`
In this example, we create a new psbt called combinedPSbt with both input and output transactions. We then sign this new batch using Alice’s private key.
Retaining Existing Signatures:
The script in the combined psbt. This can be done by modifying the scriptsig property of each input transaction.
`json
// Modify scriptsig for each Input Transaction in the combined PSBT
combinedinput [0] .scriptSig = ‘1’;
combinedoutput [0] .scriptpubkey = ‘2’; // Replace with Actual Public Key
`
Combining Signed and Unsigned Transactions:
Now that we have modified the script bytes of each input translation,
`json
// Combine signed and unsigned transactions into a new PSBT
Const combinedPSbt2 = {
Inputs: [
{scriptsig: combinedinput [0] .scriptSig},
…, // Add More Inputs As Needed
],
Outputs: […], // Initialize Empty List for Outputs
Mempool: {}, // SET MEMPOOL TO AN EMPTY OBJECT
};
`
Retaining Existing Signatures From The Signed Batch:
The script bytes of each in the script bytes of each input transaction in the combined PSBT.
`json
// Modify scriptsig for each input transaction in the combined PSBT (Same as before)
combinedPSbt2.inputs [0] .scriptSig = ‘1’;
`
Conclusion:
. Them a new batch (PSBT),
However, keep in mind. It is essential to properly modify the script by
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