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I remember seeing an old idea but unfortunately I didn't bookmark it and now I'm struggling to find the source again. Maybe someone will remember it and be able to point me to the source?

It was something like:

Have a consensus (SF) rule that allows swapping 1-sat for a 0-sat UTXO which has the number of fractions recorded as something like <fracSats> OP_DROP appended to the Script, e.g. 1-sat would convert to a 0-sat with 100 OP_DROP for 1/100 subdivision. Then, rules would enforce that these fracs add up correctly within the scope of the TX.

From PoV of old nodes, it would be a bunch of 0-sat inputs creating a bunch of 0-sat outputs, valid by consensus but currently prohibited by relay rules.

When someone collects 100 fracSats on the input side, they'd get a 1 full sat back on the output side, I don't remember how this was supposed to work without violating consensus of old nodes, maybe the UTXO would still be 0 but miners would copy the UTXOs locking bytecode in coinbase TX and credit it with 1 sat.

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    That doesn’t sound economically viable. Why would you spend dozens to hundreds of sats to create an output worth a fraction of a sat?
    – Murch
    Commented Apr 3, 2023 at 17:26
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    Viable or not, I want to find the source of this idea. Commented Apr 3, 2023 at 18:44
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    I know this is not what you are looking for, but c-lightning implements mili-satoshi: bitcoin.stackexchange.com/questions/69700/… which is probably a more reasonable implementation of this even though I have heard it causes its own slew of issues.
    – Poseidon
    Commented Apr 4, 2023 at 14:19
  • Perhaps this thread: bitcointalk.org/index.php?topic=5330102.0
    – Lee
    Commented Nov 17, 2023 at 9:31
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    Nice find, the one I can't find was along the same lines, yeah! I think what I remember seeing was older and I think it tried to specify transitions from/to regular sats to/from subdivided sats. Commented Nov 17, 2023 at 10:35

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