15_address_types.py

# SPDX-License-Identifier: MIT
"""15 - See the Bitcoin address types your node can make: legacy, SegWit, Taproot.

Asks the node for one address of each type (getnewaddress with an address_type). The
JavaScript recipe 15 derives all three from a single key offline, with no node. Run this
against a recent Bitcoin node (testnet4); bech32m/Taproot needs Bitcoin Core 23+.
Testnet only.

    RPC_USER=... RPC_PASS=... python 15_address_types.py
"""
import requests
from config import RPC_URL, RPC_USER, RPC_PASS


def rpc(method, params=None):
    payload = {"jsonrpc": "1.0", "id": "ex", "method": method, "params": params or []}
    try:
        r = requests.post(RPC_URL, json=payload, auth=(RPC_USER, RPC_PASS), timeout=15)
    except requests.exceptions.RequestException:
        raise SystemExit(f"could not reach your node at {RPC_URL}. is it running with RPC "
                         "enabled? see testnethub.com/run-node")
    if r.status_code == 401:
        raise SystemExit("the node rejected the login: set RPC_USER / RPC_PASS (see testnethub.com/rpc-safety)")
    body = r.json()
    if body.get("error"):
        raise SystemExit(f"the node rejected the call: {body['error']['message']}")
    return body["result"]


for kind, label in [("legacy", "legacy  (P2PKH)"), ("bech32", "segwit  (P2WPKH)"), ("bech32m", "taproot (P2TR)")]:
    print(f"{label} : {rpc('getnewaddress', ['', kind])}")
print("all three receive coins; SegWit and Taproot cost less to spend from.")
print("more: https://testnethub.com/keys-and-seeds")