Algorithms: The Math Behind Bitcoin, The Controlled Supply ...

Making a cashaddr vanity address

bitcoincash:qqvanlty5z9dyt5jqes0y803mf8cd5dte5wagjgjc4
I am going to share with you how to make a vanity cashaddr with vanitygen for the old address. I hope someone to make one works with cashaddr natively.
First, read the spec.
For the ordinary P2PKH address, (the one start with '1' in the old format) The version byte (First 8 bits) is 0x00. ('0000 0000' in bits) That's why every new cashaddr addresses start with 'q'. ('00000' in bech32) and the following letter also is limited to one of [qpzr]. I just went with 'qq'.
Next, construct your meaningful words only with bech32 letters. It doesn't include every alphabet and number, so be creative. I chose 'vanlty', replacing missing 'i' with 'l'.
Thankfully, the head part of the cashaddr is pure payload. We can convert bech32 string without concerning the checksum.
qqvanlty q 00000 q 00000 v 01100 a 11101 n 10011 l 11111 t 01011 y 00100 
And convert it again to hex.
0000 0 0000 0 0001 1 1001 9 1101 D 1001 9 1111 F 1101 D 0110 6 0100 4 0019D9FD64 
8 letters for 5 bits each became 10 hex for 4 bits each.
Now using this base58 encoder, let's convert it to the old address prefix.
But be careful: Because the head part of a base58 string can be subjected to the length of the string, You need the filler to match the length of valid bitcoin address.
0019D9FD640000000000000000000000000000000000000000 13Mh2zbksUtigNtWkbtgtBnifHk7knCMpb 0019D9FD64FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 13Mh2zfKjDr2Tqtqugr8s3J53CGagDjgmU 
Now, look at this base58 chart, and find all letters between the first different letter pair between the two addresses. In this case, its 'b' and 'f'. In between them, there are three letters, [cde]. We need an old address which starts with 13Mh2z, followed by one of [cde].
From this point, it's not different with making vanity address the old way. I downloaded vanitygen and used OpenCL generator.
oclvanitygen.exe -k 13Mh2zc 13Mh2zd 13Mh2ze Pattern: 13Mh2zd Address: 13Mh2zdzbV1KuwoEVLFn4eUM5h5kQQCu2F 
Finally, you can convert it back to cashaddr with this converter.
13Mh2zdzbV1KuwoEVLFn4eUM5h5kQQCu2F bitcoincash:qqvanlty5z9dyt5jqes0y803mf8cd5dte5wagjgjc4 
submitted by CokeLimeZero to btc [link] [comments]

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