Blockchains and cryptocurrencies: New paradigms for shared data
summary
Bitcoin is a payment system that removes banks by recording every transfer in a shared ledger maintained by thousands of networked computers, turning the ledger into the world's largest consensus protocol. The claim is that same ledger idea can replace cross‑organization databases, but experiments show two realities: a database with cryptographic signatures (private blockchain) adds little, while permissioned chains promise multi‑organization shared data yet have few real deployments.
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