NewBitcoindBackend spawns a new bitcoind node that connects to a miner at the specified address.

NewMiner spawns testing harness backed by a btcd node that can serve as a miner.

NewNeutrinoBackend spawns a new neutrino node that connects to a miner at the specified address.

NetParams are the default network parameters for the tests.

TrickleInterval is the interval at which the miner should trickle transactions to its peers.