The term "indelible" means that transactions on the blockchain cannot be erased, deleted, or removed. Once a transaction is written to the blockchain, it becomes a permanent part of the ledger, creating a permanent and unalterable record.

This indelibility ensures that:

1. _Transactions are forever_: Once recorded, transactions remain on the blockchain forever.

2. _No deletion_: Transactions cannot be deleted or removed, even by the parties involved.

3. _No censorship_: Transactions cannot be censored or hidden.

4. _Permanent history_: The blockchain maintains a complete and permanent history of all transactions.

Indelibility is a critical aspect of blockchain technology, ensuring that the ledger remains a reliable and trustworthy record of transactions. It also enables the creation of immutable proof of ownership, identity, and provenance, among other use cases!