[conformal/btcchain] d4082e: Add checkpoint at block height 300255.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcchain
  Commit: d4082e4f24fa58fd910b6e2bf23f6ba64e06d1c9
      
https://github.com/conformal/btcchain/commit/d4082e4f24fa58fd910b6e2bf23f6ba64e06d1c9
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-05-23 (Fri, 23 May 2014)

  Changed paths:
    M checkpoints.go

  Log Message:
  -----------
  Add checkpoint at block height 300255.