 ```python
from bitcoinlib.encoding import (
    change_base,
    addr_to_pubkeyhash,
    pubkeyhash_to_addr,
    hash160,
    to_bytes,
    convert_der_sig,
    int_to_varbyteint,
    varbyteint_to_int,
    normalize_string,
    normalize_var,
    addr_bech32_to_pubkeyhash,
    pubkeyhash_to_addr_bech3