This document discusses vanity Bitcoin addresses and split vanity address generation. It explains that vanity addresses are Bitcoin addresses that contain a specific string of characters. It then describes how split vanity address generation works, where one person (Bob) generates part of the private key (a) and public key (A), while another person (Trent) finds the remaining part (b, B). Bob's public address is the hash of A+B, and his private key is the sum of a+b.

1. Vanity Bitcoin
Addresses
Prof Bill Buchanan, The Cyber Academy
http://asecuritysite.com

2. Vanity Addresses

3. Vanity Addresses

4. Public and private keys with ECC
Pub = n x G
Private key (n):
0xc9f4f55bdeb5ba0bd337f2dbc952a5439e20ef9a
f6203d25d014e7102d86aaeeL
Public key (Pub):
0xc44370819cb3b7b57b2aa7edf550a9a5410c234
d27aff497458bbbfec8b6a327,
0x52a1a3e222cd89cbd2764b69bd9b0ea5c4fd6ca
28861e1f2140eeff9c2e76487
G:
(506626302227734366957871889516853432625
0603453777594175500187360389116729240L,
3267051002075881697808308513050704318447
1273380659243275938904335757337482424L)

5. Bitcoin
Private key:
39f21c44f02b1a0571282a3549b1bcd29
e7a994388470d4e21d0aea058b71431
Public key:
04b7f946fbdf7c84b0554bd229be56a20
943a9741a20e84d95197187641055d54
c7761969eabb0f1530acb8a94abf9c5e4
e6702fbb174adb1e1d87edd76afd8e41
Wif (Wallet Interchange Format key):
5JFojATGLW8pEza4ESKLEf9Nx9XCdDk7
RfqUsZ9fgSnQsEhzyuh
Address:
19stG779S45MRDgF2X122JyLKTuGaoV
Vs9
[Link]

6. Bitcoin
Private key:
39f21c44f02b1a0571282a3549b1bcd29e7a994388470d4e21d0aea058b71431
Public key:
04b7f946fbdf7c84b0554bd229be56a20943a9741a20e84d95197187641055d54c776
1969eabb0f1530acb8a94abf9c5e4e6702fbb174adb1e1d87edd76afd8e41
Wif (Wallet Interchange Format key):
5JFojATGLW8pEza4ESKLEf9Nx9XCdDk7RfqUsZ9fgSnQsEhzyuh
Address: 19stG779S45MRDgF2X122JyLKTuGaoVVs9

7. Bitcoin
privkey = random.randrange(2**256)
def get_key(privkey,search_for):
count = 0
address = ’’
print "Addresses tried ... (just showing first six characters of address)"
while not search_for.lower() in address.lower():
privkey += 1
pubkey_point =fast_multiply(G, privkey)
address = pubkey_to_address(pubkey_point)
print address[:6], count += 1 I
f (count>99):
return 0,0
return address,privkey
Addresses tried ... (just showing first six characters of address)
1MqVCg 18L1Sy 1BLUEh 1MQVFZ 1nA3d6 1AT81f 1DJ9kQ 12RYEK 1CWUtx 1AcDgP 12bxD3 1KNdgg 19xxHn 1885zi 1JzbWn
19ui1w 1J9RVM 1CoaMd 1FxD87 1DGSKJ 1QHeQr 16kRHz 16eNtm 1Avfbd 1DmiAA 1GCPdQ 12ANbh 1C3RWL 14TzuR
14aBU5 1Mzfpm 127kZq 1C1uGu 17G8C1 1H1W2V 14kJku 1HRazj 1NhUEJ 1PL5c9 1PktPP 16Tdks 14XbXN 1FjnPf 1GhHqE
18P4PJ 15MsvM 1DtRJ5 1H2DVm 1Lh2xC 18RCxL 124C2k 17updw 1FVA5n 1CLjQb 15JUkZ 1J9g8a 13Y1Lv 1tJkk6
Public Bitcoin address is 1tJkk66uYRRy aa Eyr6Yz9XB1NwrgxN9Mv
Private Bitcoin address is: 1291049162141473901904148853179377639061071336882801200545944876355160619226
[Link]

8. Split vanity address
generation
Prof Bill Buchanan, The Cyber Academy
http://asecuritysite.com

9. Split vanity address generation
• Bob’s keys (a,A).
• Trent finds (b,B).
• Bob’s public address:
Hash(A+B).
• Bob’s private key: a+b

10. Vanity Bitcoin
Addresses
Prof Bill Buchanan, The Cyber Academy
http://asecuritysite.com

11. Split vanity address
generation proof
Prof Bill Buchanan, The Cyber Academy
http://asecuritysite.com

12. Split vanity address generation
• Bob’s keys (a,A).
• Trent finds (b,B).
• Bob’s public address:
Hash(A+B).
• Bob’s private key: a+b

13. Split vanity address generation
a = random.randrange(2**256)
b = random.randrange(2**256)
A =fast_multiply(G, a)
B =fast_multiply(G, b)
print "Bob Private Key (a)",a
print "Bob Public Key (A)",A
print "nTrent Private Key (b)",b
print "Trent Public Key (B)",B
address = pubkey_to_address(fast_add(A,B))
print "nTrent shows public key (Hash(A+B)):",address
a_b = a+b
A_B =fast_multiply(G, a_b)
address = pubkey_to_address(A_B)
print "Bob calculates public key (Hash(Pub(a+b))):",address
print "nBob calculates private key (a+b):",a_b
[Link]