Thanks for trying and flagging the issue. I think I have fixed it now.

Keep in mind that your test will also sort out many non-native speakers, though.

We could introduce a way to commit a PQ public key as a companion for a sec256k public key, without revealing the latter. A (later) soft fork could enforce that each sec256k signature must be paired with a PQ signature if such a commitment is there.

Both the commitment as well the PQ signature could go into a newly introduced section of the blockchain (like the witness) and get discounted to be on par with sec256k signatures. This way the tx rate would not be negatively affected.

Requiring a percentage of old coins to be spent as fee will not work. People who are able to build a quantum computer can also spend a few more bucks to buy miners and mine the block containing the transaction themselves, without broadcasting it before.

Do not do this with your lightning node though, or you will lose funds!

Interesting. So an average BRC-20 transaction is smaller than an average bitcoin transaction. Would have expected it the other way round. How come?

Ok, but how do the channels to the customers get refilled?

One downside to widespread adaptation would be the cluster risk we have against the cryptographic algorithms used in bitcoin. While there is widespread belief today that they are secure, each algorithm only has a limited lifetime. If people misjudge this or cannot change them in time due to ossification, the world runs the risk that its financial system breaks down abruptly.

Need some chocolate…quick!