{
  "tool_id": "art-655-publish-market-mark-head",
  "kernel_id": "art-655-publish-market-mark-head",
  "display_name": "Publish Market Mark Head",
  "tool_version": "1.0.0",
  "mandate_type": "attestation_mandate",
  "purpose": "Publishes one SPEC.md §HEAD-1 head-commit publication event for a market's mark-price print stream (stream = \"mark:<venue>:<pair>\"), so a series of art-560-oracle-price-aggregation prints for the same pair becomes a sequence-numbered, signer-continuous chain instead of a set of unlinked artifacts a reader must independently discover and order, mirroring MRM-LINEAGE-BUILD-SPEC.md's art-649-publish-model-risk-head and NAV-LINEAGE-BUILD-SPEC.md §3 / INDEX-LINEAGE-BUILD-SPEC.md §5's own §HEAD-1 sections, applied to a market's mark-print cadence. HARD FENCE: this node never accepts or handles private key material, the caller signs the head-commit off-node via chaingraph/kernels/_head.mjs's own buildHead/signHead and separately runs its own Ed25519 verification (again via _head.mjs's verifyHeadProof/verifyChain) before calling this node. signature_valid and chain_valid are the caller's own verification claim, asserted and digested into this receipt, never independently re-derived by this node (the real zkVM guest has no WebCrypto at all, so an in-kernel Ed25519 verify result would not be reproducible across this repo's required execution environments). The one field this node DOES independently recompute is head_hash (pure SHA-256/JCS over the caller-supplied head, never trusted as a caller-asserted value, per SO #34). Backed by ocg-head-file@1 only at first, matching the model-risk/NAV/index lineage rows; a head-file tip proves the signer's claimed tip, it does not itself detect equivocation (needs ocg-head-tlog@1, a later WU) and is not itself a print-cadence/staleness enforcement mechanism. The estate's head-commit primitive (SPEC.md §HEAD-1 + _head.mjs) is merged to main; this node applies that estate-internal primitive to a market's mark-price stream and makes no claim under CFTC, SEC, or any venue's own market-data attestation obligations itself.",
  "control_description": "Publishes one SPEC.md §HEAD-1 head-commit publication event for a market's mark-price print stream (stream = \"mark:<venue>:<pair>\"), so a series of art-560-oracle-price-aggregation prints for the same pair becomes a sequence-numbered, signer-continuous chain instead of a set of unlinked artifacts a reader must independently discover and order, mirroring MRM-LINEAGE-BUILD-SPEC.md's art-649-publish-model-risk-head and NAV-LINEAGE-BUILD-SPEC.md §3 / INDEX-LINEAGE-BUILD-SPEC.md §5's own §HEAD-1 sections, applied to a market's mark-print cadence. HARD FENCE: this node never accepts or handles private key material, the caller signs the head-commit off-node via chaingraph/kernels/_head.mjs's own buildHead/signHead and separately runs its own Ed25519 verification (again via _head.mjs's verifyHeadProof/verifyChain) before calling this node. signature_valid and chain_valid are the caller's own verification claim, asserted and digested into this receipt, never independently re-derived by this node (the real zkVM guest has no WebCrypto at all, so an in-kernel Ed25519 verify result would not be reproducible across this repo's required execution environments). The one field this node DOES independently recompute is head_hash (pure SHA-256/JCS over the caller-supplied head, never trusted as a caller-asserted value, per SO #34). Backed by ocg-head-file@1 only at first, matching the model-risk/NAV/index lineage rows; a head-file tip proves the signer's claimed tip, it does not itself detect equivocation (needs ocg-head-tlog@1, a later WU) and is not itself a print-cadence/staleness enforcement mechanism. The estate's head-commit primitive (SPEC.md §HEAD-1 + _head.mjs) is merged to main; this node applies that estate-internal primitive to a market's mark-price stream and makes no claim under CFTC, SEC, or any venue's own market-data attestation obligations itself.",
  "declared_inputs": [
    "art-560-oracle-price-aggregation"
  ],
  "declared_outputs": [],
  "kernel_digest": "sha256:6c5a944ad3d3508d828bc34a320e09734f576f2f1b8522d1f9b16eac803bd568",
  "trust_label": "independently verified: zkVM execution proof (risc0/groth16-bn254)",
  "data_vintage": "2026-09-04",
  "last_validated": "2026-09-04",
  "conformance_fixtures_vendored": true,
  "compute_proof_ready": "ready",
  "wave": 111,
  "source_url": "https://ainumbers.co/mcp.html",
  "generated_at": "2026-09-05T02:26:40.419Z"
}