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There seems to be two types of bulletproof transactions in monero, was there maybe a bug in the first one?

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RCTTypeBulletproof2 adds some additional data (beyond the RCTTypeBulletproof type):

  • It changes the field nbp to a varint field, which has the count of Bulletproof signatures [source]
  • It adds the encrypted amount to each output [source]
  • What does "count of bulletproof signatures" mean? The amount of rangeproofs in the tx? Which would be equal to the amount of outputs? – WeCanBeFriends Jun 24 at 23:43
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    It should equal the number of outputs, yes. – jtgrassie Jun 24 at 23:52
  • Why does it need to be added if we can look at the number of outputs? – WeCanBeFriends Jun 24 at 23:53
  • Don't quote me on this, I think it's because there can be a pseudo output which doesn't need a sig. – jtgrassie Jun 25 at 0:00
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    Initially I thought it might have been related to a dummy output not needing a range proof (e.g. for mimicking a two output tx), but on further digging, it doesn't seem to be being used anywhere. – jtgrassie Jun 25 at 0:18

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