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Date: Sat, 08 Mar 2025 23:48:54 +0000
To: Nighttime Satoshi <nighttimesatoshi@gmail.com>
From: Pieter Wuille <bitcoin-dev@wuille.net>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Proposal: Unlocking Dust UTXOs as Miner Transaction Fees
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Hello,
This is not a soft fork, for two reasons:
* Coinbase transactions can only have exactly one input. I don't think ther=
e is a particularly good reason for this besides simplicity, but that is th=
e current rule. Allowing a coinbase transaction to additionally also spend =
certain outputs would require a hardfork.
* The outputs being marked as dust are not allowed to be spent by miners. C=
hanging this requires a hardfork as well. Think about it: if this was possi=
ble with a softfork, it must mean that doing what you're proposing would *a=
lready be legal* today, and thus not need this proposed change in the first=
place. Softforks can only outlaw formerly legal behavior.
Furthermore, I don't really see the point. The proposal requires both a coi=
nbase txin to spend the coin, plus a signature in a separate transaction, i=
n the same block. To pay the miner for the opportunity cost of not includin=
g normal transactions with these bytes, the fee for this OP_RETURN output s=
hould economically be priced at the block's feerate for the size of the OP_=
RETURN output *plus* the cost of the coinbase transaction input. Together, =
they are no smaller (and with witness discount, I suspect larger) than the =
user just spending their "dust" output, and thus the fee for using this OP_=
RETURN-based mechanism would be larger than the value of the dust output.
--=20
Pieter
On Saturday, March 8th, 2025 at 1:23 PM, Nighttime Satoshi <nighttimesatosh=
i@gmail.com> wrote:
> Dear fellow Bitcoin developers,
>=20
> I'm excited to share a proposal addressing a long-standing Bitcoin challe=
nge: economically unviable dust UTXOs.
--=20
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