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From: Eric Voskuil <eric@voskuil.org>
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Subject: Re: [bitcoindev] UTXO checkpoint transactions
Date: Tue, 28 Jan 2025 01:42:31 -0500
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To: Erik Aronesty <erik@q32.com>
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr"=
>Hi Erik,</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Miners committin=
g to a checkpoint does not make the checkpoint valid. The only way one woul=
d know it=E2=80=99s valid is by validating the chain up to that point.</div=
><div dir=3D"ltr"><br></div><div dir=3D"ltr">Given that it implies one woul=
d be trusting hash power for validity there is no need for a utxo set. SPV =
is sufficient. A utxo set is only necessary for validation.</div><div dir=
=3D"ltr"><br></div><div dir=3D"ltr">e</div><div dir=3D"ltr"><br><blockquote=
type=3D"cite">On Jan 28, 2025, at 01:32, Erik Aronesty <erik@q32.com>=
; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"lt=
r">=EF=BB=BF<div dir=3D"auto">Has it been considered to add a UTXO checkpoi=
nt transaction <div dir=3D"auto"><br></div><div dir=3D"auto">Here's ho=
w it would work </div><div dir=3D"auto"><br></div><div dir=3D"auto">So=
meone submits a transaction that contains a large fee and a hash of the UTX=
O set along with block height as opcode parameter </div><div dir=3D"au=
to"><br></div><div dir=3D"auto">Miners refuse to include this transaction u=
nless the hash of the UTXO set matches </div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto">Because performing that hash is expensive, it should h=
ave an extremely high cost factor, equivalent to say a 100KB transaction or=
something </div><div dir=3D"auto"><br></div><div dir=3D"auto">These c=
heckpoints are explicitly for the purpose of fast-synchronizing extremely l=
ightweight nodes. It's reasonable to refuse to use a checkpoint that =
isn't at least several months old. It should be easy for anyone=
to find a sufficiently aged checkpoint and synchronize from that point onw=
ard.</div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Or is this just a solution without a problem?</div><div dir=3D"au=
to"><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div =
dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></=
div></div>
<p></p>
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