Networks | Bitcoin — BizFirstAI

Network	Purpose	Default Esplora endpoint
`mainnet`	Production — real BTC, real fees, irreversible transactions.	`https://blockstream.info/api`
`testnet`	Public test network with free faucet coins. Safe for pipeline development.	`https://blockstream.info/testnet/api`
`signet`	Signed test network, more stable block times than testnet. NBitcoin has no distinct Signet network object — this node decodes signet addresses using testnet's address-encoding version bytes as a compatible fallback.	Not pre-configured — add your own signet Esplora instance's URL.
`regtest`	Local/private regression-test network — mine blocks on demand. Typical for integration tests.	Not pre-configured — add your own regtest node/Esplora instance's URL.

Only mainnet and testnet ship pre-configured. Add a signet or regtest entry under Bitcoin:Networks in appsettings.json (see Configuration) pointing at your own Esplora-compatible instance to use them.

Adding a Network

"Bitcoin": {
  "Networks": {
    "mainnet": { "EsploraApiUrl": "https://blockstream.info/api", "BroadcastEndpoint": "https://blockstream.info/api/tx" },
    "testnet": { "EsploraApiUrl": "https://blockstream.info/testnet/api", "BroadcastEndpoint": "https://blockstream.info/testnet/api/tx" },
    "signet":  { "EsploraApiUrl": "https://your-signet-esplora/api", "BroadcastEndpoint": "https://your-signet-esplora/api/tx" }
  }
}

Both EsploraApiUrl and BroadcastEndpoint must use http or https — startup validation rejects any other scheme (e.g. a file:// URL or a typo) before the node can serve traffic.

SLIP-44 Coin Type by Network

When deriving a key from a BIP-39 mnemonic (wallet/deriveAddress, psbt/sign with walletType: mnemonic), the default derivation path picks the SLIP-44 coin_type based on the requested network — this is not optional or configurable per call, it's derived automatically so a testnet wallet can never silently derive a mainnet-path address:

Network	coin_type	Default path (P2WPKH, BIP-84)	Default path (P2TR, BIP-86)
`mainnet`	`0'`	`m/84'/0'/0'/0/0`	`m/86'/0'/0'/0/0`
`testnet` / `signet` / `regtest`	`1'`	`m/84'/1'/0'/0/0`	`m/86'/1'/0'/0/0`

Supply your own derivationPath on any wallet operation to override this default.

Network is required on every write/signing operation. Read operations fall back to Bitcoin:DefaultNetwork when network is omitted, but psbt.*, wallet.deriveAddress/signMessage, and transaction.broadcast all require it explicitly — see Configuration.