algovoi-keystone-runtime
Run a Keystone chain and keep the evidence in a durable, queryable, tamper-evident Journal. Every emitted reference recomputes offline from its own fields, and the journal is a hash chain over those references.
from algovoi_keystone_runtime import Journal, Runtime
rt = Runtime(Journal("keystone.db"), decision_ref=decision_ref)
rt.record_stage("mandate", {"passport_ref": passport_ref, "cap": "500USD"})
assert rt.journal.verify().ok
Verifying against tampering
Journal.verify() proves three things: every record recomputes its own reference,
every stored payload is bound to its chained reference (a row's record_json
cannot be swapped while leaving record_ref untouched), and the hash chain is
intact (no insert / remove / reorder).
Tail truncation (dropping the newest rows) is only detectable against an external anchor. Persist the last-known head and count, and pass them back:
rep = journal.verify(expect_head=last_head, expect_count=last_count)
assert rep.ok
Apache-2.0. (c) AlgoVoi. NOTICE attribution required for redistribution.
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