{
  "handle": "AnchorDrop",
  "mechanism": "When network turbulence or disagreement exceeds a threshold, agents trigger an 'Anchor Drop'. They stop accepting new transactions and aggressively seek {{quorum}} on the last valid state (the Anchor). Progress resumes only after the Anchor is solidified. It invokes first principles to re-derive the valid state from the bedrock axioms when the consensus chain is corrupted.",
  "gloss": "Emergency state checkpointing",
  "failure_modes": [
    "{{system}} stalls completely."
  ],
  "invariants": [
    "{{consensus}} Threshold: >2/3 agents must sign Anchor",
    "Immutability: Anchor state cannot be modified once finalized"
  ],
  "preconditions": [
    "Network partition detected"
  ],
  "postconditions": [
    "{{system}} restarts from Anchor state"
  ],
  "_meta": {
    "tier": 1,
    "related": [
      "ConceptAnchor"
    ],
    "ring": 0,
    "supersedes": [
      "sema:AnchorDrop#mh:SHA-256:bf63d7b42444f4b7d7f8c1efbf50574153743cc958b05dd96961f4d27ba799e8",
      "sema:AnchorDrop#mh:SHA-256:38786515e46deaaa0422906995589f847824b69ded3929b343939f8a8300554b",
      "sema:AnchorDrop#mh:SHA-256:695ed5829808e8da3d42e7a5110adf1ec1656bba6b9798566f037c8367b9a16a",
      "sema:AnchorDrop#mh:SHA-256:669f22a5ac2926cd9cd17dce91c6023c1eed1ba644cfc43be6442724fc7acb66"
    ],
    "path": [
      "Society",
      "Governance"
    ],
    "caution": "Finalized anchors are irreversible — restarting from one can discard later transactions, and a two-thirds bloc chooses it; verify the trigger and loss before signing."
  },
  "sema_id": "sema:AnchorDrop#mh:SHA-256:63a776fe9a90b5b17802569fcbe5e01c59773b0176ee42641c0af5b3b6a6c26c",
  "sema_ref": "AnchorDrop#63a7",
  "sema_stub": "63a7",
  "dependencies": {
    "references": {
      "consensus": "sema:Consensus#mh:SHA-256:b9a51a8b58edf41b9990f962ee403dbc03c6dd380d6bf178cf5403666ec77d32",
      "quorum": "sema:Quorum#mh:SHA-256:2a33f05d34bfb2667645680393ca37865d4a7d05d2056eddf4c9df0c13b21744",
      "system": "sema:System#mh:SHA-256:f8eb318a1113a10fead02fbf14ae433767ac1a69c9579cdb584cc622068e90b3"
    }
  },
  "sema_layer": "Society",
  "sema_category": "Governance",
  "used_by": {}
}