{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://sigelo.invalid/schema/v0/common.json",
  "title": "sigelo/0 shared definitions",
  "description": "Building blocks for the sigelo/0 object schemas (SPEC §2, §3, §3.1). The host in $id is a placeholder (.invalid) until the project domain is chosen. Patterns are ECMA-262 regular expressions evaluated with Unicode semantics (the 'u' flag): #/$defs/string relies on it to refuse a lone surrogate while accepting a surrogate PAIR as one character. What JSON Schema cannot express, and a verifier must still check: duplicate keys (a parse-time rule, SPEC §3), exp > iat, a rotation's next != id, every signature, DID-hash and chain rule, and each payment method's own address and sig_addr checks.",
  "$defs": {
    "string": {
      "description": "A JSON string of Unicode scalar values that are not noncharacters: no lone surrogate, no U+FDD0..U+FDEF, no U+xFFFE / U+xFFFF in any plane (SPEC §3.1, I-JSON).",
      "type": "string",
      "pattern": "^[^\\uD800-\\uDFFF\\uFDD0-\\uFDEF\\uFFFE\\uFFFF\\u{1FFFE}\\u{1FFFF}\\u{2FFFE}\\u{2FFFF}\\u{3FFFE}\\u{3FFFF}\\u{4FFFE}\\u{4FFFF}\\u{5FFFE}\\u{5FFFF}\\u{6FFFE}\\u{6FFFF}\\u{7FFFE}\\u{7FFFF}\\u{8FFFE}\\u{8FFFF}\\u{9FFFE}\\u{9FFFF}\\u{AFFFE}\\u{AFFFF}\\u{BFFFE}\\u{BFFFF}\\u{CFFFE}\\u{CFFFF}\\u{DFFFE}\\u{DFFFF}\\u{EFFFE}\\u{EFFFF}\\u{FFFFE}\\u{FFFFF}\\u{10FFFE}\\u{10FFFF}]*$"
    },
    "key": {
      "description": "An object key: no lone surrogate, never __proto__ (SPEC §3.1).",
      "$ref": "#/$defs/string",
      "not": { "const": "__proto__" }
    },
    "int": {
      "description": "An integer in ±(2^53−1) (SPEC §3). Floats, exponents and larger integers are malformed.",
      "type": "integer",
      "minimum": -9007199254740991,
      "maximum": 9007199254740991
    },
    "jcsValue": {
      "description": "Anything JCS can serialize under SPEC §3: null, booleans, integers in range, strings without lone surrogates, and arrays and objects of the same, at any depth.",
      "anyOf": [
        { "type": ["null", "boolean"] },
        { "$ref": "#/$defs/int" },
        { "$ref": "#/$defs/string" },
        { "type": "array", "items": { "$ref": "#/$defs/jcsValue" } },
        {
          "type": "object",
          "propertyNames": { "$ref": "#/$defs/key" },
          "additionalProperties": { "$ref": "#/$defs/jcsValue" }
        }
      ]
    },
    "version": { "description": "The wire version (SPEC §3.1).", "const": "sigelo/0" },
    "unixSeconds": {
      "description": "iat / exp: Unix seconds, an integer in [0, 2^53−1] (SPEC §3.1). exp > iat is required too but is not expressible here.",
      "type": "integer",
      "minimum": 0,
      "maximum": 9007199254740991
    },
    "multibase": {
      "description": "Multibase base58btc: 'z' then the Bitcoin base58 alphabet (SPEC §2).",
      "type": "string",
      "pattern": "^z[1-9A-HJ-NP-Za-km-z]+$"
    },
    "nonce": {
      "description": "A nonce (genesis, binding, invoice): multibase z + base58btc, 1 to 63 digits, so at most 64 characters (SPEC §2). The §5.2 challenge nonce is exempt: opaque, the world's choice.",
      "type": "string",
      "pattern": "^z[1-9A-HJ-NP-Za-km-z]{1,63}$"
    },
    "publicKey": {
      "description": "An Ed25519 public key: multibase of multicodec 0xed01 plus 32 raw bytes, which always spells z6Mk plus 44 characters (SPEC §2).",
      "type": "string",
      "pattern": "^z6Mk[1-9A-HJ-NP-Za-km-z]{44}$"
    },
    "signature": {
      "description": "An Ed25519 signature on the wire: multibase of the 64 raw bytes, no multicodec prefix (SPEC §2).",
      "type": "string",
      "pattern": "^z[1-9A-HJ-NP-Za-km-z]{1,88}$"
    },
    "did": {
      "description": "did:sigelo: + multibase of the raw 32-byte SHA-256 of the JCS genesis (SPEC §2, §4).",
      "type": "string",
      "pattern": "^did:sigelo:z[1-9A-HJ-NP-Za-km-z]{1,44}$"
    },
    "commitment": {
      "description": "A recovery commitment: sha256: + lowercase hex SHA-256 of the raw 32-byte recovery public key (SPEC §4).",
      "type": "string",
      "pattern": "^sha256:[0-9a-f]{64}$"
    },
    "created": {
      "description": "RFC 3339 UTC, exactly YYYY-MM-DDTHH:MM:SSZ: uppercase T and Z, no fraction, no offset, seconds 00-59 (no leap second), and a real Gregorian date (SPEC §4). The day-of-month limit (30 April, 29 February in leap years only) is checked by the verifiers but is not expressed here.",
      "type": "string",
      "pattern": "^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]Z$"
    },
    "atomicUnits": {
      "description": "A non-negative decimal integer as a string, no sign, no fraction, no leading zeros (SPEC §6.3).",
      "type": "string",
      "pattern": "^(0|[1-9][0-9]*)$"
    }
  }
}