SHA-256 is widely used in blockchain technology to create digital signatures that secure transactions. Here's how:

1. *Digital signatures*: SHA-256 is used to create digital signatures that verify the ownership and authenticity of transactions.

2. *Transaction hashing*: The transaction data is hashed using SHA-256, creating a unique digital fingerprint.

3. *Private key signing*: The transaction hash is signed using the sender's private key, creating a digital signature.

4. *Public key verification*: The digital signature is verified using the sender's public key, ensuring that the transaction is authentic and came from the sender.

5. *Ownership verification*: The digital signature verifies the ownership of the transaction, ensuring that only the owner can spend or transfer the assets.

By using SHA-256 to create digital signatures, blockchain networks can ensure:

1. *Transaction security*

2. *Ownership authenticity*

3. *Tamper-evidence*

4. *Immutable transactions*

This ensures that transactions are secure, trustworthy, and resistant to tampering, making SHA-256 a fundamental component of blockchain technology.