Bitcoin: Help! About how to spend OP_checksigadd Multi-sig

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Safely managing multiple sig transactions with Bitcoin.js

As a developer who uses Bitcoin. Ys, you may have encountered the need to manage multiple SIG transactions. Multi -signature (Multisig) wallet allows multiple addresses to allow and approve transactions on behalf of one address. In this article, we will explore how to create a secure and reliable multisig setting at Bitcoin.Js.

Problem: OP_Checksigadd

When using OP_CHECKSigadd, it adds one or more signature signature to another public key. However, if there is only one valid signature, the transaction may be rejected by the network. To reduce this risk, we will use another approach using op_checksig and ‘op_eckal’ with a 3-2 threshold.

Creating Safe Multisig Setup

To create a multisig setting at Bitcoin.Js, you must follow these steps:

• Create a 3-2 threshold account : Define the public key that will be used for the primary account. This key must be at least three signatures and at least two of them must be valid.

• Create a secondary account : Create another public key that will be used to authorize transactions on behalf of the primary account. This key should be less than 4 signatures (one signature is not valid).

3
Generate a common secret : Use op_checksig to generate a common secret between the two accounts. This common secret will be all the necessary information for permission.

• Check the common secret : Use OP_EQUAL with a common secret and one of the secondary account signatures to verify its validity.

Sample code

`JavaScript

Const bitcoinjs = ask (‘bitcoinjs-lib’);

// Create a 3-2 threshold account

Const PrimaryaccountpubKey = ‘XPRV …’;

Const PrimarysigpubKey1 = ‘XPRV …’; // 3 signatures

Const primarysigpubkey2 = ‘xprv …’; // 2 signatures

Const primarysigpubkey3 = ‘xprv …’; // Invalid signature

// Create a secondary account

CONST SECIDARYAKOUTPUBKEY = ‘XPRV …’;

Const SECOVERSIGPUBKEY1 = ‘XPRV …’; // less than 4 signatures (one is not valid)

// generate a common secret using OP_CHECKSIG and one of the signatures of primary accounts

ASYNC Function Generateharedsecret () {

Const sharedsecretpubKey = wait for bitcoinjs.secp256K1.CreateYPAir (Primaryaccountpubkey);

Const Signature1 = Expect Bitcoinjs.secp256K1.Sign

Const Signature2 = Expect Bitcoinjs.secp256K1.Sign

Const Signature3 = Expect Bitcoinjs.secp256K1.Sign

Return {sharedsecret: json.stringify ({secret: sharedSecretpubkey, Signatures: [Signature1, Signature2, Signature3]})};

}

// Check the common secret using OP_ECKAL with one of the secondary account signatures

ASYNC Function VerifysharedSecret (SharedSecret) {

CONST {SharedSecret: {secret, signatures} = json.parsse (SharedSecret);

Const signature = wait for bitcoinjs.secp256k1.Sign (secret, secondaryigpubkey1);

Return Signature === Signatures [0];

}

// Example Use:

Generateharedsecret (). Then (SharedSecret => {

VerifysharedSecret (SharedSecret) .Then (verified => Console.log (verified));

});

`

Best Practice

• Use a safe and reliable seed for the primary account.

• Make sure all secondary accounts have less than 4 signatures (one is not valid).

• Keep a common secret safe to prevent unauthorized access.

• Consider using a stronger cryptographic library, such as “Bitcoinjs-SECP256K1”, which provides better security functions.

By doing these activities and best practices, you can safely manage multisig transactions in your Bitcoin.Js application. Remember to always carefully handle sensitive information and follow the guidelines provided by the Bitcoin community.

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