duplicate coinbase transactions are allowed, and there are 2 pairs of dups #612

issue dmgores opened this issue on November 7, 2011
  1. dmgores commented at 4:21 AM on November 7, 2011: none

    take a look at:

    block hashes: 0x00000000000271A2DC26E7667F8419F2E15416DC6955E5A6C6CDF3F2574DD08E 0x00000000000743F190A18C5577A3C2D2A1F610AE9601AC046A38084CCB7CD721 they have duplicate coinbase transactions: 0xE3BF3D07D4B0375638D5F1DB5255FE07BA2C4CB067CD81B84EE974B6585FB468 block height 91722, 91880, on 2010-11-14 08:37:28, 2010-11-15 00:36:19

    block hashes: 0x00000000000AF0AED4792B1ACEE3D966AF36CF5DEF14935DB8DE83D6F9306F2F 0x00000000000A4D0A398161FFC163C503763B1F4360639393E0E4C8E300E0CAEC they have duplicate coinbase transactions: 0xD5D27987D2A3DFC724E359870C6644B40E497BDC0589A033220FE15429D88599 block height 91812, 91842, on 2010-11-14 17:59:48, 2010-11-14 21:04:51

    The miner was using the same signature "0x0456720E1B00" on all 4 of these coinbase transactions. The public keys for those two pairs of duplicates were: "0x4104124B212F5416598A92CCEC88819105179DCB2550D571842601492718273FE 0F2179A9695096BFF94CD99DCCCDEA7CD9BD943BFCA8FEA649CAC963411979A33E9AC" and "0x41046896ECFC449CB8560594EB7F413F199DEB9B4E5D947A142E7DC7D2DE0B811 B8E204833EA2A2FD9D4C7B153A8CA7661D0A0B7FC981DF1F42F55D64B26B3DA1E9CAC"

    • Should we allow this guy to spend his duplicate transactions? This would make code and data structures more complex for eternity... when verifying transactions we'd have to get a list of transactions for each hash, instead of just a single transaction... and mark a non-spent one as newly spent.
    • Or should we make a rules like "no more duplicate transactions when height > 91880" and "only one of a set of existing duplicate transactions are spendable coinbase"? I like this. :) Come on, we totally should have rejected those duplicate transactions!
  2. dmgores commented at 4:33 AM on November 7, 2011: none

    FYI none of those transaction outputs have been spent yet.

  3. TheBlueMatt commented at 3:58 PM on November 7, 2011: member

    Its been long known that one can generate duplicate coinbase transactions. Currently, if a miner modifies their bitcoind to create duplicate coinbase transactions, they will be able to spend one of the two transactions and the remaining ones will be unspendable. I see no reason to make major rules modifications to help those who broke their own coins.

  4. dmgores commented at 4:01 PM on November 7, 2011: none

    OK, thanks!

  5. dmgores closed this on Nov 7, 2011
  7. TheBlueMatt commented at 5:25 PM on February 6, 2012: member

    Oops, yea you can MineA SpendA MineA SpendA, but not MineA MineA SpendA SpendA.

  8. JonasPertschy commented at 7:54 PM on May 5, 2016: none

    In sense of completeness: CVE-2012-1910

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