def METHOD_NAME():
    # Calculate matured balance
    payload = json.dumps({"jsonrpc": "2.0", "method": "listunspent",
                          "params": [1, 1_000_000_000, [Net.REGTEST_P2PKH_ADDRESS]], "id": 0})
    result = requests.post(BITCOIN_NODE_URI, data=payload)
    result.raise_for_status()
    utxos = result.json()['result']
    matured_balance = sum(
        utxo['amount'] for utxo in utxos if utxo['confirmations'] > COINBASE_MATURITY)
    logger.debug("matured coins in regtest slush fund=%s", matured_balance)
    return matured_balance