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Title: how many bitcoin address with prefix calcul Post by: Kostelooscoin on March 02, 2020, 11:15:18 AM hello guys,
how many bitcoin address with prefix 12c6 example 12c6 FtDFVfovY2cxDLDKYghtpa9v G1KKeu (bitcoin prefix) (24^58 ?) (bitcoin checksum) Title: Re: how many bitcoin address with prefix calcul Post by: BrewMaster on March 02, 2020, 11:57:42 AM somewhere between 1 and 31^58 (31 because the longest bitcoin address in base58 can be 35 characters and you fixed the first 4 characters).
if you also fix the checksum which is i believe a little less than 5 characters then the number shrinks by a lot but still can be more than just one since it is a 4 byte collision with only a couple of initial bytes of the data set. any particular reason you are asking this? Title: Re: how many bitcoin address with prefix calcul Post by: Kostelooscoin on March 02, 2020, 12:32:35 PM somewhere between 1 and 31^58 (31 because the longest bitcoin address in base58 can be 35 characters and you fixed the first 4 characters). if you also fix the checksum which is i believe a little less than 5 characters then the number shrinks by a lot but still can be more than just one since it is a 4 byte collision with only a couple of initial bytes of the data set. any particular reason you are asking this? to understand more and by chance this checksum is calculated? thanks for response. Title: Re: how many bitcoin address with prefix calcul Post by: BrewMaster on March 02, 2020, 03:11:57 PM to understand more and by chance this checksum is calculated? then you have to look into how this type of addresses are created (https://en.bitcoin.it/wiki/Technical_background_of_Bitcoin_addresses) and also the encoding used in them (https://en.bitcoin.it/wiki/Base58Check_encoding). going in reverse won't answer your questions. in short the checksum is calculated by taking the 21 bytes input (version + result of HASH160) and performing 2 times SHA256 on it then taking the first 4 bytes. Title: Re: how many bitcoin address with prefix calcul Post by: odolvlobo on March 03, 2020, 02:08:41 AM The same question was recently asked in this thread: https://bitcointalk.org/index.php?topic=5215344.0
I think it will provide the information you might be looking for. Title: Re: how many bitcoin address with prefix calcul Post by: bigvito19 on March 03, 2020, 01:46:37 PM Based off Vanitygen:
The number of all BTC addresses starting with a prefix indicated is: 2^160 / (difficulty of that vanity address). Then you need a software to compute the difficulty. 12c6 --> difficulty = 77178 --> number of all BTC addresses starting 12c6 --> 2^160 / 77178 = 18,936,764,846,600,105,188,054,689,584,030,203,162,247,435 that begins with 12c6 |