zebra/zebra-rpc/qa/base_config.toml

[mining]
miner_address = "t27eWDgjFYJGVXmzrXeVjnb5J3uXDM9xH9v"

[network]
listen_addr = "127.0.0.1:0"
network = "Regtest"

[rpc]
listen_addr = "127.0.0.1:0"

[state]
cache_dir = ""

[network.testnet_parameters.activation_heights]
NU5 = 290
NU6 = 291