Blockchain
A distributed digital ledger that records transactions across a network of computers.
Explained Simply
A blockchain is a chain of data blocks, each containing a batch of transactions. Once a block is added, it cannot be altered without changing all subsequent blocks, making the record tamper-resistant. Different blockchains use different consensus mechanisms (like Proof of Work or Proof of Stake) to agree on which transactions are valid. Bitcoin, Ethereum, and Solana each run on their own blockchain with different trade-offs between speed, cost, and decentralization.
Example
When you send Bitcoin to someone, that transaction is recorded in a block on the Bitcoin blockchain. Thousands of computers worldwide verify and store this record.
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