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Date: Wed, 4 Jun 2025 11:35:37 +0000
From: Peter Todd <pete@petertodd.org>
To: bitcoindev@googlegroups.com
Subject: [bitcoindev] V3/TRUC miner adoption
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FYI I ran a short experiment with my Alice OpenTimestamps calendar to see what
% of hash power was mining nVersion=3 (TRUC) transactions. I was upgrading the
Bitcoin node on the Alice calendar to v29.0 and was curious.

The following transactions were broadcast with nVersion=3 over the course of
about 20 hours:
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 	

...every transaction was mined by either Foundry USA (28% hashpower), F2Pool
(10%), or MARA (8%).

Notably, Antpool does not appear to mine V3 transactions - it missed multiple
opportunities at high fee-rates. Presumably that's true for Antpool proxies as
well.

I don't know if Foundry USA or F2Pool is actually following the TRUC
standardness rules; I suspect MARA is not based on my discussions with them
about how their backend works.

It's possible that poor propagation is the issue here. But up-to-date Libre
Relay nodes also relay V3 transactions, and they're currently quite well
connected. I'm sure Antpool runs enough nodes that if they accepted V3, they'd
be getting them.

This was just a short test so there's a good chance I missed some smaller
miners who would have mined V3/TRUC transactions; given the lack of hash power
mining V3 I'm going to switch it back later today to avoid delaying timestamps
unnecessarily.

If this information was useful to you, feel free to send some sats to pay for
OTS transaction fees:

https://geyser.fund/project/opentimestamps
https://alice.btc.calendar.opentimestamps.org/

-- 
https://petertodd.org 'peter'[:-1]@petertodd.org

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