extensions.json

{
  "_comment": "Chain-specific signed extensions configuration. Maps chain names to their TxExtension/SignedExtra layouts. Only include fields that actually encode bytes (omit unit types and None options). See documentation below.",
  "_field_types": {
    "unit": "Zero-sized field (no bytes encoded) - omit from config",
    "era": "1 byte (immortal 0x00) or 2 bytes (mortal era encoding)",
    "compact": "SCALE compact-encoded integer (variable: 1, 2, or 4 bytes)",
    "fixed_hash_32": "Fixed 32-byte hash",
    "option_hash_32": "Option<32-byte hash> (discriminant 0x00=None, 0x01+32 bytes=Some)",
    "option_u32": "Option<u32> (discriminant 0x00=None, 0x01+4 bytes=Some)"
  },
  "_example": "To add a new chain: 1) Get SignedExtra/TxExtension definition from chain source, 2) Create entry listing fields that encode bytes in order, 3) Run: bun cli.ts add-chain --name <name> --ws-url <url>",

  "enjin": {
    "comment": "Enjin Matrix TxExtension (spec 1040+): Order is CheckMortality, CheckMetadataHash, CheckNonce, ChargeTransactionPayment (phantom: CheckSpecVersion, CheckTxVersion, CheckGenesis, CheckWeight, CheckFuelTank). Verified from live RPC.",
    "signedExtensions": [
      { "name": "CheckMortality", "type": "era" },
      { "name": "CheckMetadataHash", "type": "metadata_mode" },
      { "name": "CheckNonce", "type": "compact" },
      { "name": "ChargeTransactionPayment", "type": "compact" }
    ]
  },
  "canary": {
    "comment": "Canary Matrix TxExtension: Order is CheckMortality, CheckMetadataHash, CheckNonce, ChargeTransactionPayment (same as Enjin Matrix after spec 1040).",
    "signedExtensions": [
      { "name": "CheckMortality", "type": "era" },
      { "name": "CheckMetadataHash", "type": "metadata_mode" },
      { "name": "CheckNonce", "type": "compact" },
      { "name": "ChargeTransactionPayment", "type": "compact" }
    ]
  },
  "enjin-relay": {
    "comment": "Enjin Relay TxExtension: CheckEra, CheckNonce, ChargeTransactionPayment, CheckMetadataHash (phantom: CheckSpecVersion, CheckTxVersion, CheckGenesis, CheckWeight)",
    "signedExtensions": [
      { "name": "CheckEra", "type": "era" },
      { "name": "CheckNonce", "type": "compact" },
      { "name": "ChargeTransactionPayment", "type": "compact" },
      { "name": "CheckMetadataHash", "type": "option_hash_32" }
    ]
  }
}