Abstract: Techniques for enhancing the security and privacy of blockchain are described. One approach implements a blockchain encryption management system. The system includes multiple nodes that are each configured to integrate encryption-related services with a distributed blockchain ledger. The consensus mechanism of the blockchain ledger is used to communicate information, requests, and responses about encryption-related functions performed throughout the system. For example, a new encryption key can be transmitted from a first node to a second node by securely recording the key in the blockchain ledger. The key is communicated to the second node via the blockchain consensus mechanism. This key can then be used by the second node to encrypt the contents of a transaction that is recorded in blockchain ledger, thereby providing privacy to the parties to the transaction.