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Before launch the plant (topology, capacities, leaks) and every valve's burst specification were hashed, each specification with its own random salt. The hashes were folded into one root and the root was written to Solana with the Memo program. When a valve opens, its specification and salt are published. Nothing on this page trusts the server: it hashes what it is given and compares.
Paste a revealed specification (JSON) and its salt. The seal is sha256("valve:v1:hook:" + canonical JSON + ":" + salt).