Ethereum: How does OP_CHECKSIG work

Understanding OP_Checksig: Private key signature force Ethereum

As a beginner who learns about Bitcoin, scripts and public keystrok cryptography (P2PKH), it is important to cover the term “op_checksig”. In this article, we will go into the private key signature in the world on Ethereum blockchain.

What is op_checksig?

OP_CHECKSIG is a special Opcode in Ethereum’s virtual machine (EVM), which allows developers to sign deal with their private keys. It is used to test the authenticity and integrity of the transaction, ensuring that the sender has control over the funds transferred.

How do op_checksig work?

When the user signs the transaction using his own private key, he encrypts it with a checksum, which is then passed through op_checksig opcode. The EVM verifies the signature against the known public key stored in the blockchain, ensuring that the sender has control over the means.

Here is a step -by -step divided as a op_checksig:

1
Development of the transaction : When the user wants to send funds to another node on the network, they create a deal using their own private key.

• Encryption : Then the transaction is encrypted with checksum (eg ECDSA-256). This ensures that the sender cannot ruin or change the content of the transaction.

3
Signature creation

: EVM generates a transaction signature, which is a unique identifier that depicts the sender's private key. This signature includes:

* Sender's public address (also known as the address “NO”

* HIFTER Data Sender hash

• OP_Checksig OPCODE : OP_CHECKSIG OPCODE is applied to the signed transaction that verifies its integrity and authenticity.

• Public Key Check

  

  : EVM verifies the signature against a public key stored in the blockchain (eg address “0x …”). This ensures that:

* The sender has control over transferred means

* Signature is valid for a given transaction

Code Example

`SOLIDITY

Pragma Solidity ^0.8.0;

Signer of the Agreement {

Function Signtransaction (address from, UINT amount) public {

// generate a private key using KECCAK256

byte32 Privatekey = keccak256 (both.Encodepacked (No));

// encrypt the transaction data with the private key

bytes memory transactions = both.Encodepacked (amount);

// Sign the deal with Privatekey

BAITS32 Signature = Keccak256 (both.Encodepacked (Privatekey, Transactentata));

// Apply OP_CHECKSIG to the signed transaction

assembly {

// Check that the sender has control over the transfered means

Let Public_Key: = 0x …; // Replace with a valid public key

Let SIG = KECCAK256 (both.Encodepacked (Public_Key, Signature))

// Check the signature in line with the expected public keys and transaction data

if (sig == public_key) {

return the truth;

} else {

return false;

}

}

}

}

`

In this example, we use a “signatorial” agreement to sign the transaction with their private key. The “Signtransaction” feature generates a private key using KECCAK256, encrypts transaction data, sign it with a private key and apply `OP_CHECKSIG” to test its integrity.

Conclusion

In summary, op_checksig is an essential Opcode Ethereum in a virtual machine that allows developers to sign deal with their private keys. By checking the signature against a public key stored in the blockchain, EVM shall ensure that the sender has control over the funds transferred. This basic concept plays a crucial role in the secure and reliable transaction processing on the Ethereum network.