Blockchain digital currencies are decentralized crypto technologies that assist users in performing secure transactions by exploiting their funds. The decentralized, immutable ledgers are the blockchain electronic databases that record the transactions with unchangeable characteristics. The blockchain ledgers remain unchangeable and enable high reliability and security in blockchain-based systems. Blockchain technology utilizes cryptographic hashing to accomplish immutability. Some of the benefits of blockchain immutable ledgers are as follows.
  •  Tight Security
  •  High Quality
  •  Ensures Authenticity
  •  High Privacy
 However, accomplishing blockchain immutability in various decentralized applications has to face some challenges that are,
  •  51% Attack
  •  Quantum Computing