{
  "$id": "https://manav.id/.well-known/manav-schemas/contract.sign.json",
  "action": "contract.sign",
  "version": 1,
  "fields": {
    "contract":     {"type": "string"},
    "counterparty": {"type": "string"},
    "annual_value": {"type": "money"},
    "effective":    {"type": "string"},
    "reference":    {"type": "string"},
    "document":     {"type": "digest"}
  }
}