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Do they have a client installed on their servers that pulls the info out of block headers? How does it do it? What's the command?

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Blockchain.info definitely has a client installed on their servers, that's where they get all the block data from. I heard they're using a fork of BitcoinJ.

In the Bitcoin-qt daemon, you can get the difficulty of the latest block with the getdifficulty command, and you can get complete information about every block, including the difficulty, with getblock.

  • How would I do it without a UI, say, if I installed bitcoind on my server? – Kinnard Hockenhull Dec 7 '12 at 7:08
  • If you can access it with a CLI, you can go to the daemon directory and run bitcoind.exe with the required command as a parameter. Other than that there's something called JSON-RPC but I don't really know what that is. – Meni Rosenfeld Dec 7 '12 at 7:54
  • Drats, I have a Mac . . . – Kinnard Hockenhull Dec 14 '12 at 2:44
  • @KinnardHockenhull: Are you talking about a computer you have locally? I don't know how Macs work, but doesn't it have a command prompt? – Meni Rosenfeld Dec 14 '12 at 4:37
  • @KinnardHockenhull Open up spotlight and type in "terminal" for the command line. If your bitcoind instance has JSON-RPC enabled through config you can use CURL to access the data – Christopher Mar 3 '13 at 23:22

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