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
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