The immutable ledger is a fundamental aspect of blockchain technology, ensuring that transactions are:

1. *Permanent*: Once recorded, transactions are stored forever.

2. *Tamper-proof*: Transactions cannot be altered or modified.

3. *Indelible*: Transactions cannot be deleted or removed.

This immutability is achieved through the use of cryptographic hashes, linking each block to the previous one, creating a chain of blocks (hence the name blockchain!). Any attempt to alter a transaction would require recalculating the hashes of all subsequent blocks, making it computationally impossible.

The immutable ledger provides a secure and reliable record of transactions, building trust and confidence in the blockchain network. It also enables:

1. *Auditability*: A clear and transparent record of transactions.

2. *Accountability*: All transactions are traceable and identifiable.

3. *Compliance*: Meets regulatory requirements for data immutability.

The immutable ledger is a powerful feature of blockchain technology, ensuring the integrity and reliability of transactions!