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I have a bitcoin-qt and bitcoin-abc on same computer running, can both share the same beginning of the blockchain data file ? since they both have same history till point in time.

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It's not a documented feature, but Bitcoin Core and its derivatives only write to the last blk*.dat file, and only read the others. So you can create symlinks to have them share older files. I've done this (for testnet) and it worked fine.

  • What possible cons do you see with this solution? – Haddar Macdasi Oct 9 '17 at 14:46
  • @HaddarMacdasi: I can't really think of any. Of course, if you decide to delete one, you'll have to move the files accordingly. – Nate Eldredge Oct 9 '17 at 16:06

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