There are approximately 120,000,000,000,000,000,000,000,000,000,000,000,000,000,000 possible addresses that start with 1bitco (that's 1.2 X 1044).
There are approximately 80,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 possible addresses that do NOT start with 1bitco (that's 8 X 1052).
So, for every address that you find that starts with 1bitco, you need to search through on average approximately 666,666,667 addresses.
There are approximately 80,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 possible addresses that do NOT start with 1bitco (that's 8 X 1052).
So, for every address that you find that starts with 1bitco, you need to search through on average approximately 666,666,667 addresses.
Able to do the maths for "ojm"
?http://bitcoinvanitygen.com/
how do I use it in my wallet?
(Bitcoin-QT)
Make sure to find one services that allows you to generate split vanity key. If no, the security will be 0 since the server knows your private key.