Overwriting Prevention refers to mechanisms that protect data in blockchain systems from being overwritten or tampered with. In a decentralized network, each transaction is recorded in blocks that are linked together, creating a permanent and unalterable history. This design ensures that once data is written, it cannot be changed without compromising the integrity of the entire chain.Techniques for Overwriting Prevention include cryptographic hashing, where each block contains a unique hash generated from its data and the hash of the previous block. This means any attempt to alter a block would change its hash, invalidating all subsequent blocks.Additionally, consensus algorithms, like Proof of Work or Proof of Stake, help maintain the order and authenticity of transactions. They require network participants to agree on the validity of new entries before they are added.By employing these methods, blockchain systems ensure that historical records remain intact, providing security and trust for users by preventing unauthorized changes and maintaining a transparent ledger.