Package: bitcoin-message-tool
Bitcoin Message ToolBitcoin Message ToolA lightweight CLI tool for signing and verification of bitcoin messages.
Bitcoin message is the most straightforward and natural way to prove ownership over
a given address without revealing any confidential information.This tool closely follows specification described in BIP137:Please note that "since this format includes P2PKH keys, it is backwards compatible,
but keep in mind some software has checks for ranges of headers and will report the newer
segwit header types as errors."More info:https://github.com/bitcoin/bips/blob/master/bip-0137.mediawikiInstallationTo install with pip, run:pip install bitcoin-message-toolQuickstart GuideUsage:

python -m bitcoin_message_tool -h

or

python bmt.py -h
usage: python3 bmt.py [-h] {sign,verify} ...

Bitcoin message signing/verification tool

positional arguments:
{sign,verify}

options:
-h, --help     show this help message and exitMessage signing:python bmt.py sign -h
usage: python3 <application> sign [-h] -p -a {p2pkh,p2wpkh-p2sh,p2wpkh} -m [MESSAGE ...] [-d] [-e] [-v]

options:
-h, --help            show this help message and exit

Sign messsage:
-p, --privkey         private key in wallet import format (WIF)
-a {p2pkh,p2wpkh-p2sh,p2wpkh}, --addr_type {p2pkh,p2wpkh-p2sh,p2wpkh}
                        type of bitcoin address
-m [MESSAGE ...], --message [MESSAGE ...]
                        Message to sign
-d, --deterministic   sign deterministtically (RFC6979)
-e, --electrum        create Electrum-like signature
-v, --verbose         print prettified messageExample 1:
Non-deterministic signature for compressed private key and p2pkh address$python bmt.py sign -p -a p2pkh -m ECDSA is the most fun I have ever experienced

PrivateKey(WIF): <insert private key here>Output:Bitcoin address: 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL
Message: ECDSA is the most fun I have ever experienced
Signature: IBuc5GXSJCr6m7KevsBAoCiX8ToOjW2CDZMr6PCEbiHwQJ237LZTj/REbDHI1/yelY6uBWEWXiOWoGnajlgvO/A=Example 2:
Deterministic signature for compressed private key and p2pkh address$python bmt.py sign -p -a p2pkh -m ECDSA is the most fun I have ever experienced -d

PrivateKey(WIF): <insert private key here>Output:Bitcoin address: 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL
Message: ECDSA is the most fun I have ever experienced
Signature: HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLapfa43JjyrRqdSA0pxs=Example 3:
Deterministic signature for compressed private key and p2pkh address (verbose mode)$python bmt.py sign -p -a p2pkh -m ECDSA is the most fun I have ever experienced -d -v

PrivateKey(WIF): <insert private key here>Output:-----BEGIN BITCOIN SIGNED MESSAGE-----
ECDSA is the most fun I have ever experienced
-----BEGIN BITCOIN SIGNATURE-----
175A5YsPUdM71mnNCC3i8faxxYJgBonjWL

HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLapfa43JjyrRqdSA0pxs=
-----END BITCOIN SIGNATURE-----Example 4:
Uncompressed private keys can't produce addresses other than 'p2pkh'python bmt.py sign -p -m ECDSA is the most fun I have ever experienced -a 'p2wpkh'  -d -v

PrivateKey(WIF): <insert private key here>Output:Traceback (most recent call last):
...
PrivateKeyError: ('Need WIF-compressed private key for this address type:', 'p2wpkh')Message verification:python bmt.py verify -h
usage: python3 <application> verify [-h] -a ADDRESS -m [MESSAGE ...] -s SIGNATURE [-e] [-v] [-r]

options:
-h, --help            show this help message and exit

Verify messsage:
-a ADDRESS, --address ADDRESS
                        specify bitcoin address
-m [MESSAGE ...], --message [MESSAGE ...]
                        Message to verify
-s SIGNATURE, --signature SIGNATURE
                        bitcoin signature in base64 format
-e, --electrum        verify Electrum-like signature
-v, --verbose         print full message
-r, --recpub          recover public keyExample 1:
Standard message verificationpython bmt.py verify -a 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL \
> -m ECDSA is the most fun I have ever experienced \
> -s HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLapfa43JjyrRqdSA0pxs=Output:TrueExample 2:
Message verification in verbose modepython bmt.py verify -a 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL \
> -m ECDSA is the most fun I have ever experienced \
> -s HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLapfa43JjyrRqdSA0pxs= \
> -vOutput:True
Message verified to be from 175A5YsPUdM71mnNCC3i8faxxYJgBonjWLExample 3:
Display a recovered public keypython bmt.py verify -a 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL \
> -m ECDSA is the most fun I have ever experienced \
> -s HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLapfa43JjyrRqdSA0pxs= \
> --recpubOutput:True
024aeaf55040fa16de37303d13ca1dde85f4ca9baa36e2963a27a1c0c1165fe2b1Example 4:
Error messagepython bmt.py verify -a 175A5YsPUdM71mnNCC3i8faxxYJgBonjWL \
> -m ECDSA is the most fun I have ever experienced \
> -s HyiLDcQQ1p2bKmyqM0e5oIBQtKSZds4kJQ+VbZWpr0kYA6Qkam2MlUeTr+lm1teUGHuLaffa43Jj= -v -r \Output:Traceback (most recent call last):
...
SignatureError: ('Signature must be 65 bytes long:', 57)ContributeIf you'd like to contribute to bitcoin_message_signer, check outhttps://github.com/shadowy-pycoder/bitcoin_message_tool