Blockchain as an Immutable Ledger of Sealed Blocks
concept
Core idea
A blockchain is a chain of blocks. Each block contains many transactions and is cryptographically sealed to the previous one by a block hash. Once a block is confirmed it cannot be reversed or altered, so an investigator is always reading a fixed moment in the past. Transactions are not final until their block is sealed.
When to use
When explaining to a client or court why on-chain records are reliable, or when reasoning about whether a transaction is confirmed and final.
Example
A visual shows each block as a bus: people boarding are transactions, and once the doors close (the block is sealed) the bus drives off and nothing can be changed.
Related
Transaction Hash as an Immutable Receipt, Gas, Gwei, and Staker Fees
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