Blockchain is a distributed digital ledger system that ensures the security of transactions through a tamper-evident and irreversible design. The mechanism relies on cryptographic hashing, where even the slightest change in data produces a drastically different hash, making tampering easily detectable. Moreover, each block incorporates the hash from the previous block, ensuring that changes to any block would invalidate subsequent blocks. Consensus mechanisms help networks agree on what is added to the blockchain, maintaining the integrity of the ledger in a decentralized manner. Code examples illustrate these concepts in action, providing insight into the underlying mechanisms.
When the data is altered even minutely, the hash value alters significantly - this makes tampering obvious.
Chaining Blocks: Each block saves the hash of the last one. When a person attempts to alter one block, all the subsequent blocks are invalidated.
A blockchain is a distributed digital ledger that stores transactions in a manner that makes them tamper-evident and irreversible.
Networks employ consensus algorithms to reach a consensus on what is added to the blockchain.
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