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I want to generate very long vanity addresses, with the relaxed constraint that I don't need the corresponding private key, they only need to be valid Bitcoin addresses. How would I do this?
Example:
Input Prefix: 1XXXXXXXXXXXXXXXXXXXX
Output: 1XXXXXXXXXXXXXXXXXXXXUW9j3f3
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You can do this manually using the hex/base58check converter (such as the converter on brainwallet.org)
Remove the starting 1 and convert from base58 XXXXXXXXXXXXXXXXXXXXXXXXXXX to hex: 25c7415deb828c49ccb799c452ae17589bca1af2 (make sure result is 24 bytes)
Remove last 4 bytes to get a 20-byte hash:
25c7415deb828c49ccb799c452ae17589bca1af2 -> 25c7415deb828c49ccb799c452ae1758
Convert from hex 25c7415deb828c49ccb799c452ae1758 to base58check: 1XXXXXXXXXXXXXXXXXXXXXYDgWVE
Final result is valid 1XXXXXXXXXXXXXXXXXXXXXYDgWVE
http://bitcoin.stackexchange.com/questions/3139/how-can-i-generate-a-vanity-bitcoin-address?rq=1 – kaoD – 2014-01-11T07:59:59.027
2Here's one: 1AnyCoinsSentHereAreDestroyedKPAHm – Diego Basch – 2014-02-22T06:02:14.217
3n00b question, why would you want to do this? – Phill Pafford – 2014-02-24T14:06:10.297