{
  "handle": "Sign",
  "mechanism": "The {{act}} of attaching a verifiable {{identity}} proof to an {{artifact}}, asserting authorship, approval, or agreement. Unlike a raw {{signal}}, a Sign action creates a link between the entity and the data that a third party can verify without the entity's cooperation. Used to validate contracts or authorize actions.",
  "gloss": "Attest to authorship or agreement",
  "invariants": [
    "Binds the signing {{identity}} to the {{artifact}}.",
    "Verifiable by a third party without the signer's cooperation.",
    "Invalidates if the {{artifact}} changes."
  ],
  "_meta": {
    "tier": 1,
    "ring": 1,
    "supersedes": [
      "sema:Sign#mh:SHA-256:1fb991fd538b93a9e2566b3f2a4c69f67a6b101d0577d911f50a4e194c1dc6ba",
      "sema:Sign#mh:SHA-256:d89a18b44321e4b9ba9aada7ac698f69ef9f24a2b0d92e0906168554604a301c"
    ],
    "path": [
      "Infrastructure",
      "Primitives"
    ]
  },
  "signature": [
    "Act(Identity)"
  ],
  "sema_id": "sema:Sign#mh:SHA-256:b2020447ec4c2725a139c6117c764cf464643e6e83379e86263267f95e4965ee",
  "sema_ref": "Sign#b202",
  "sema_stub": "b202",
  "failure_modes": [
    "Legitimate retraction: a signature is permanent, so a signer who changes their mind cannot unsign.",
    "Brittle integrity: a typo fix invalidates the signature along with the substantive change.",
    "Legal gap: technical non-repudiation is not legal non-repudiation, which has separate requirements."
  ],
  "dependencies": {
    "accepts": {
      "artifact": "sema:Artifact#mh:SHA-256:b533ad2674ec00c5e9a5f1e3920f1097e2bc1eea7263f89e8f46563fa319a0ee"
    },
    "composes_with": {
      "act": "sema:Act#mh:SHA-256:2dfedd75a396f2639ce949b9f5270766350b9c7404d404c11c57140fcf030455"
    },
    "references": {
      "identity": "sema:Identity#mh:SHA-256:b24a57fdd59ebf2ef019be30af8fa10fc127f61d346a74ab0b49f729b4e32093",
      "signal": "sema:Signal#mh:SHA-256:6eaff8a06e08e75279670bc09d88175d130815240fdfb3a21252c0364769c1fc"
    }
  },
  "sema_layer": "Infrastructure",
  "sema_category": "Primitives",
  "used_by": {
    "references": {
      "AuditTrail": "sema:AuditTrail#mh:SHA-256:163b784f86e448340b94d0459483f0f476e052b5b7c589113f5c7df5dd1115a8",
      "Contract": "sema:Contract#mh:SHA-256:98747322ee31ffa265a8dfd6609d726e0dcba9c513e5ec85742c6c04e4afaa26",
      "FailureTrace": "sema:FailureTrace#mh:SHA-256:8085febc5bf923c52ce1856893c7739e5d9be3bdc021767766ad949f717a974e"
    },
    "composes_with": {
      "Award": "sema:Award#mh:SHA-256:4c5d0b7992809eebff99b727da727b08f4659773607c2621d8181b5d816e4b23"
    }
  }
}