Calculate Bitcoin address corresponding to given ECDSA private key. Handy for verifying document timestamps provided by OriginStamp.org.

ecdsa_to_bitocin_addy.py

#!/usr/bin/env python
"""Calculate Bitcoin address corresponding to given ECDSA private key.
Handy for verifying document timestamps provided by OriginStamp.org.

Usage: ecdsa_to_bitocin_addy.py ecdsa_private_key   # that's a 64-character hex string

Prerequisite:

 pip install ecdsa

Core logic from https://bitcointalk.org/index.php?topic=84238.0
See also https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses#How_to_create_Bitcoin_Address
"""

import sys
import ecdsa

usage = "Usage: %s ecdsa_private_key (64-character hex)" % sys.argv[0]

secp256k1curve=ecdsa.ellipticcurve.CurveFp(115792089237316195423570985008687907853269984665640564039457584007908834671663,0,7)
secp256k1point=ecdsa.ellipticcurve.Point(secp256k1curve,0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798,0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8,0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141)
secp256k1=ecdsa.curves.Curve('secp256k1',secp256k1curve,secp256k1point,(1,3,132,0,10))

#--------------------------------------

import binascii, hashlib

def addy(pk):
 """
 Return Bitcoin address corresponding to given ECDSA private key.

 E.g. to verify https://app.originstamp.org/s/9f05ce06f0ca898f883cd32e54381448f440072a5545e9318c63d7ed425fcc84

 >>> addy(0x8f650ae299dbdf92558579fd4524e29df2424b0a3c5ce3c715fd2c6160681853)
 '1NS3x99PykY5Aa9J8fSstu2NcAws5kBrVy'
 """

 pko=ecdsa.SigningKey.from_secret_exponent(pk,secp256k1)
 pubkey=binascii.hexlify(pko.get_verifying_key().to_string())
 pubkey2=hashlib.sha256(binascii.unhexlify('04'+pubkey)).hexdigest()
 pubkey3=hashlib.new('ripemd160',binascii.unhexlify(pubkey2)).hexdigest()
 pubkey4=hashlib.sha256(binascii.unhexlify('00'+pubkey3)).hexdigest()
 pubkey5=hashlib.sha256(binascii.unhexlify(pubkey4)).hexdigest()
 pubkey6=pubkey3+pubkey5[:8]
 pubnum=int(pubkey6,16)
 pubnumlist=[]
 while pubnum!=0: pubnumlist.append(pubnum%58); pubnum/=58
 address=''
 for l in ['123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'[x] for x in pubnumlist]:
  address=l+address
 return '1'+address

if __name__ == "__main__":
    # print addy(0x18E14A7B6A307F426A94F8114701E7C8E774E7F9A47E2C2035DB29A206321725)
    # print addy(int(hashlib.sha256('something small and easy to remember but not easy to guess').hexdigest(),16))
    # print addy(int(hashlib.sha256(file('hiddeninplainsight.jpg','rb+').read()).hexdigest(),16))

    if len(sys.argv) < 2:
        print(usage)
        sys.exit(1)

    ecdsa_private = sys.argv[1]

    print("Bitcoin address is %s for ECDSA private key\n %s" % (addy(int(ecdsa_private, 16)), ecdsa_private))

Note that there is
https://pypi.org/project/bitcoinaddress/