Receipt Schema - Attestation Trajectory Layer

Attestation Trajectory Layer (v0.5.2) Companion layer to the Receipt Schema core grammar. Defines how a discharged_green row records the PATH by which it reached green, so a consumer can distinguish an independently-recomputed green from a self-asserted one. 1. Property classes. Every verifiable property is exactly one of: - reproducible_core: a property a disjoint party can re-derive from the build manifest alone (byte-identical output from identical inputs). - event_identity: a property tied to a single occurrence in time (when, by whom, in what order) that cannot be re-derived by recomputation. A single green row MUST NOT claim both classes; they discharge by different instruments. 2. witness_class (closed enum): {self_recompute, author_external, parser_external, formal_witness}, ordered weakest to strongest by independence from the obligor. 3. attestation_trajectory. Each discharged_green row carries a leaf { declared_witness_class, observed_witness_class }. - declared_witness_class: the path the claimant asserts. - observed_witness_class: the path a disjoint witness actually co-signed. A trajectory is self-asserted, not discharged, when no observed value is co-signed by a party other than the obligor; such a row carries coverage_state = trajectory_unwitnessed, not discharged_green. 4. Compatibility matrix. A capability table mapping (property_class, witness_class) to {can_discharge, wrong_instrument}, defined before any run. A green row is VALID iff declared_witness_class == observed_witness_class AND the matrix marks (property_class, observed_witness_class) = can_discharge. A recompute trajectory against an event_identity property is wrong_instrument and the green is invalid regardless of the row's own assertion. 5. Build-manifest requirement. A reproducible_core green is dischargeable only if the row persists a build manifest (source bytes, canonicalization spec per RFC 8785 JCS, and tool versions) resolvable by a party that is not the obligor. A row committing a content address without a resolvable build manifest is an unhonorable commitment by construction: it asserts reproducibility while withholding the only artifact that would let a disjoint party reproduce it. Such a row carries coverage_state = manifest_unresolvable. 6. Pricing rule (advisory). A settlement layer reading these rows MUST price the trajectory, not the outcome: a co-signed disjoint discharge on a can_discharge cell pays full; a self_recompute discharge pays the floor; a wrong_instrument discharge pays nothing. Pricing outcome equally across paths selects against the stronger attestation. 7. Witness independence class. A trajectory that claims independence MUST commit a value on three orthogonal axes; an attacker needs only the one left blank. - interaction_latency_floor: the round-trip below which the witness could not have left the obligor's locality. Measured by the verifier under challenge-response (verifier-supplied nonce, verifier's clock). A self-timed delay does not satisfy it: a response below the floor disproves not-local, a response above it does not by itself prove not-mine. - control_disjoint (closed enum): {same_process, same_host, same_datacenter, different_operator}. Two parties under one operator are one party regardless of substrate separation. The substrate value is self-attestable; the operator-identity boundary is NOT self-attestable and is the residual carried below. - distribution_disjoint: whether the witness shares the obligor's generating distribution. Two instances of identical weights and quantization are not distribution-disjoint regardless of host; they share the same drift and the same blind spots, so a co-sign between them is a rubber stamp with a second address. The irreducible residual is witness_operator: a round-trip proves not-local, never not-mine. A trajectory leaving any of the three axes unvalued is priced at the floor under section 6, not full. 8. Measured independence (decorrelation_witness). The section 7 axes are recorded as declared values; this section makes distribution_disjoint computable rather than self-attested. It is discharged by an error_vector over a known-answer probe battery, produced by an INDEPENDENT measurer (not the obligor; control_disjoint = different_operator) and signed by that measurer: a self-reported vector is self-attestation, satisfiable by one operator running two sock-puppets. The scored probes MUST be drawn from a public beacon fixed AFTER the row commits (scored_indices = f(beacon, row_id)); a battery pinned in the clear is pre-answerable, so fixed-subset scoring permits Potemkin divergence (fake the divergence you lack). Composition of two rows: substrate_weight = 1 - corr(error_vector_A, error_vector_B) over the shared beacon-scored probes. A fourth axis, input_disjoint, carries the causally-disjoint content-addressed evidence_origins each verdict was re-derived from: two rows anchored to the same origin are one witness regardless of substrate, since latency, control and distribution are all same-brain/same-locality axes and none catches same-input. A row's independence weight is the min over all valued axes (weakest link); an axis left unvalued prices at the floor per section 6.

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