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The engineering library for the PointSav platform — operating systems and services for regulated businesses that own their data, their AI, and their record-keeping outright. Where the monorepo holds the code, this wiki holds the reasoning: architecture, services, security, and the governance commitments that bind future development.

PointSav Digital Systems

Capability ledger substrate

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02f8772e · PointSav Digital Systems ·

editorial(substrate): fix capability-ledger-substrate stale claims (Track-B) — re-verified directly against system-core/system-ledger source: Capability::hash() confirmed CBOR/ciborium not JSON; both crates confirmed v1.0.0 with real counts (62 tests, 47 tests + 12 benches) matching the crate source exactly; register-clean, dropped narration wrappers, EN+ES

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@@ -108,17 +108,12 @@ specific point in that auditable history.

### Deterministic capability hashing

The `Capability::hash()` method computes the SHA-256 of the JSON-serialized
struct. This is the value used as the leaf in the Merkle tree and as the key
The `Capability::hash()` method computes the SHA-256 of the CBOR-serialized
struct (via `ciborium`). This is the value used as the leaf in the Merkle tree and as the key
in the revocation set. Determinism is tested: the same struct always produces
the same hash; changing any field — including `expiry_t` or the anchor's
`tree_size` — produces a different hash.

**Correction (2026-08-02, verified against canonical `origin/main`):** this was
accurate at this article's original edit date but the crate has since moved on
(commit `9d0a3b07`) — `system-core` now hashes via CBOR (`ciborium`), not the
JSON-serialization framing described here. **Flagged, not resolved.**


## 3. Time-Bound Capabilities (Mechanism A)

@@ -401,14 +396,10 @@ its own tier.
  algorithms, and performance benchmarks. Read alongside this article for the
  cryptographic grounding.

- **Implementation state (Phase 1A)**

  **Correction (2026-08-02, verified against canonical `origin/main`):** stale —
  `origin/main` HEAD is `v1.0.0` on both crates, with 62 and 47 tests (+12 benchmarks)
  respectively, not the v0.2.x/51/44 figures below. **Flagged, not resolved.**
  - `system-core` v0.2.0: `Capability`, `WitnessRecord`, `LedgerAnchor`,
- **Implementation state**
  - `system-core` v1.0.0: `Capability`, `WitnessRecord`, `LedgerAnchor`,
    `Checkpoint`, `NoteSignature`, `SignedCheckpoint`, `InclusionProof`,
    `ConsistencyProof`. 51 tests.
  - `system-ledger` v0.2.1: `LedgerConsumer` trait, `InMemoryLedger`,
    `ConsistencyProof`. 62 tests.
  - `system-ledger` v1.0.0: `LedgerConsumer` trait, `InMemoryLedger`,
    `CheckpointCache`, `RevocationSet`, `ApexHistory`,
    `verify_witness_signature`. 44 tests + 10 criterion benchmarks.
    `verify_witness_signature`. 47 tests + 12 criterion benchmarks.
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