{
  "service": "spark-entity",
  "description": "A self-hosted Spark Entity (Lightspark's statechain L2, buildonspark/spark) on Bitcoin SIGNET, operated by mineracks as a developer testbed",
  "network": "signet",
  "status": "experimental — signet only; the operator code is upstream Apache-2.0 at commit 0b3a32a; Lightspark and Flashnet run the production entity, this one is independent and for testing",
  "topology": "3 signing operators, 2-of-3 FROST threshold, one Postgres, one VM in Brisbane, Australia",
  "operators": "https://spark.mineracks.com/operators.json  (identifier, identityPublicKey, address — paste into the JS SDK ConfigOptions.signingOperators)",
  "coordinator": "spark-0.mineracks.com",
  "endpoints": {
    "operator_0": "https://spark-0.mineracks.com",
    "operator_1": "https://spark-1.mineracks.com",
    "operator_2": "https://spark-2.mineracks.com"
  },
  "transport": "gRPC (node) and grpc-web (browser) over HTTPS on 443, TLS at the Cloudflare edge — no custom CA needed",
  "electrs": "https://signet.mineracks.com/api  (use as electrsUrl in the SDK)",
  "not_supported": "no Spark Service Provider: Lightning send/receive, cooperative exit and swaps are unavailable; deposits, tree creation, off-chain transfers and unilateral exit work",
  "limits": { "requests_per_second_per_ip": 50, "burst": 100 },
  "faucet": "https://testnet4-faucet.mineracks.com is testnet4; for signet coin ask us or use a public signet faucet",
  "operator": "mineracks Pty Ltd, Brisbane, Australia",
  "contact": "info@mineracks.com",
  "since": "2026-09-17"
}