Blockchain for Developer - What's behind the hype?
summary
Argues blockchain is mainly a replicated data structure with two operating models — permissionless public chains and permissioned private chains — and that smart contracts are validation rules not magic. Names tools used: Hyperledger Fabric, Quorum and Ethereum derivatives; public chains need mining and hit ~15 transactions per second while private networks drop mining and reach database-like throughput. Gives a concrete porting use case (3,500 telcos, fax still used), a cheap document timestamping ROI, and points to zero-knowledge proofs for future privacy.
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