Concept comparison
Blockchain vs Database
A database optimizes trusted coordination; a blockchain accepts overhead to coordinate without one operator.
Dimension
Blockchain
Database
Trust model
Many independent nodes verify shared rules.
One organization or authority controls writes and permissions.
Takeaway: Blockchains are useful when operators do not fully trust one another.
Performance
Slow, replicated, and intentionally expensive to mutate.
Fast, efficient, and easy to index or update.
Takeaway: If a trusted database works, it is usually the simpler tool.
History
Append-only history is central to the design.
History is optional and can be edited by administrators.
Failure recovery
Nodes can independently reconstruct valid state from history.
Recovery depends on backups and operator processes.
Takeaway: Decentralized verification trades speed for resilience against one-sided edits.