Step 16 turned the blockchain-data-structure into an immutable append-only data store, which can be used as a manipulation-resistant ledger for transaction data. Having one immutable append-only history of transaction data in insolation may be of limited value for the goal of clarifying ownership based on a group of computers that acts as witnesses of ownership-related events. Hence, this step focuses on establishing a purely distributed peer-to-peer system that allows sharing of information about transactions.
The Metaphor
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