Bitcoin: Is it possible to combine two PSBTs while retaining the existing signatures?

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:

Bitcoin: Is it possible to combine two PSBTs while retaining the existing signatures?

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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