4

Input: any old Bitcoin address e.g.

1BCNEPySL4gzzjg8NNyNsQYJWYmZwpgaPF

Output: the FirstBits, in this case 1BCN1u

  • can you please tell where I can read about old and new bitcoin addresses? – Salvador Dali Oct 18 '13 at 23:49
  • @SalvadorDali - I don't understand what you mean "old and new addresses" – ripper234 Oct 19 '13 at 14:31
4

Blockchain.info has APIs to generate and resolve firstbits.

Get firstbits,

http://blockchain.info/q/getfirstbits/1BCNEPySL4gzzjg8NNyNsQYJWYmZwpgaPF

Get address,

http://blockchain.info/q/resolvefirstbits/1paypal

http://blockchain.info/q/resolvefirstbits/1ebay

http://blockchain.info/q/resolvefirstbits/1google

  • What is the purpose of this? – bvpx Oct 18 '13 at 14:58
  • 1
    @bvpx: Https://en.bitcoin.it/wiki/Firstbits tells us that firstbits are basically a way for bitcoin users to type a few less key strokes (an address shortner for bitcoin addresses). However there are more than a few downsides to it. I hope the information is helpful.n Just start at the beginning and learn everything bitcoin wiki touches on. Feel reese to ask more questions. I always suggest using the search engine before posting so you keep good rep. You can always privately message me. But I am over on my altcoins pool mostly. – Joe White Oct 18 '13 at 15:22
  • 2
    This service seems to be out of order currently. – akaihola Apr 22 '14 at 5:25
1
+100

Having seen that yes blockchain.info no longer offers this service I was able to find only one other Block explorer that do offer the FirstBit lookup on addresses:

https://www.walletexplorer.com

https://www.walletexplorer.com/address/1BCN1ugdKdWd9pQ8Am9hMhtHZfmbXzxE8a?from_firstbits=1BCN1u

Hope this helps :)

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