The main concern I'd have is whether or not doing so would leak more information to the world about how to conduct such an attack on mainnet. It may be prudent to perform such testing privately.

On Fri, Feb 13, 2026 at 5:28 PM 'Antoine Poinsot' via Bitcoin Development Mailing List <bitcoindev@googlegroups.com> wrote:
Hi everyone,

Bitcoin Inquisition 29.2 was released last week with support for BIP 54 (Consensus Cleanup) [0]. BIP
54 is now active on Inquisition since block 291168.

By virtue of being a bugfix soft fork rather than introducing new features, there is fewer avenues
for testing on the public Signet network. Perhaps we could create a Signet block that is slow but
not quite as bad as the worst case, and share it here to demonstrate it is now invalid on
Inquisition?

At any rate, please let us know if you find anything in testing whether it is on the public Signet
network, in private ones, or however else.

Best,
Antoine Poinsot

[0] https://delvingbitcoin.org/t/bitcoin-inqusition-29-2/2236

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