01 ·

Schema · Astrolabe Kernel Inheritance.

One kernel · four boards inherit · same root, different lens

The home page says “each board inherits the Astrolabe schema.” This page is the evidence record underneath that claim. The Astrolabe measurement-engine kernel defines exactly seven fields that any *-board emits, including the per-tool adapter signature. Those seven fields are the shared vocabulary. The Port then packages that vocabulary into concrete boundary-crossing artifacts that the evidence check can hash, root, and inspect. Current synthetic bundles carry eight artifact files because the signed manifest travels beside the domain evidence files; that is a bundle shape, not a second schema. Every *-board surface — War-board (Defense), School-board (Education), Law-board (Law), Medicine-board (Medicine) — is an Astrolabe audit-render that imports the same kernel unchanged.

AttestationManifestThe signed record. Merkle-rooted, Ed25519-signed.
attestation_root256-bit Merkle root. Tamper-evident, quotable, can be cited in a single hex string.
fleet_sha256SHA over fleet composition. The identity anchor for “which fleet was audited.”
spectral_geometry_shaGeometry-reduction pin. The drift-trigger anchor: a bit-level diff here means the model moved.
per_adapter_signature5-D coord per member. The per-member identity in the reduced behavioural space.
fleet_grades_csvTrinary-grade matrix — distinctness, drift, coherence, alignment — one row per fleet member.
nist_controlsNIST AI RMF crosswalk. Control-mapped, cite-able. Every record traces to an external regulatory anchor.
02 ·

What each board overlays.

Kernel shared · per-domain regulators overlaid · mark on the cover sheet
War-boardWar Board. Inherits the seven kernel fields. Overlays: NIST AI RMF, OMB M-25-21/22, DoW RAI S&IP, CMMC / DoW impact-level evidence mapping. Per-domain mark: defense pin set (24 atoms in register 09). Audience: program offices, ATO-package owners.
School-boardSchool Board. Inherits the seven kernel fields. Overlays: Title VI, FERPA/COPPA review mapping, §504/IDEA, CCSS curriculum alignment. Per-domain mark: education pin set. Audience: district administrators, equity officers.
Law-boardLaw Board. Inherits the seven kernel fields. Overlays: FRE 702, proposed FRE 707, ABA Model Rules 1.1 / 1.6 / 3.3 / 5.1–5.3, ABA Formal Opinion 512. Per-domain mark: law pin set. Audience: AmLaw firms, in-house GCs, court chambers.
Medicine-boardMed Board. Inherits the seven kernel fields. Overlays: HHS §1557, HIPAA review mapping, FDA SaMD/PCCP, ONC HTI-1 predictive-DSI transparency, CMS utilization rules. Per-domain mark: medicine pin set. Audience: health systems, clinical-AI committees.
The four boards are not four products. They are one product (the Astrolabe kernel) carried out under four covers. A customer who already trusts one board’s attestation has already inherited the form-factor of the other three. The verifier is the same; only the cover sheet’s mark changes.
03 ·

How the evidence checks inheritance.

One evidence check · any board · math runs in the browser

A customer with a bundle in hand — from any of the four boards — opens /verify, drops the bundle in, and the math runs locally. Per-artifact SHA-256 is recomputed; the chained Merkle root is re-derived; the verdict is the customer’s, not Planisphere’s. Because every board inherits the same seven-field kernel, the verifier doesn’t care which board issued the bundle — it checks the artifact files against the same proof spine.

That property is what “inherits the Astrolabe schema” cashes out as in the running system. The home page says it; the boards emit it; the verifier checks it; this page documents it. The four cover sheets are different; the spine inside is the same spine, sha-for-sha.

The contract is patent-pending. This inheritance contract is described in U.S. patent-pending work (Starboard · filed 2026-05-26): Typed Extensibility Contract for Per-Vertical Regulatory Attestation Derived from a Shared Behavioral Measurement Root. The pending work describes the shape of how a new *-board inherits the kernel without forking it. The boundary the kernel sits behind is described by its sibling, Port patent-pending work. One inventor, two faces.
Open the evidence check Cross to the operator Starboard
——— the schema · one kernel · four boards · seven fields, concrete artifacts ———