Subject: Re: [bitcoindev] The Tragic Tale of BIP30

From: Luke Dashjr <[email-masked]>
Date: Sun, 27 Apr 2025 14:20:44 -0400

On 4/27/25 12:45, Ruben Somsen wrote:
> #### Solution B

Solution C could be to remove it, but restore the previous UTXO. In 
other words, treat the overwrite as a spend of the overwritten transaction.

Solution D could be to simply not create the UTXOs later overwritten 
when they are first seen.

> Given that we have no duplicates, barring the two exceptions, we could 
> replace the inefficient BIP30 UTXO set check with a coinbase 
> uniqueness check. We simply cache the coinbase TXIDs and ensure there 
> are no duplicates. Doing this until block 227931 results in a modest 
> ~7MB cache.

And additional CPU time to check the txids against 7 MB instead of 64 
bytes. Sounds strictly worse than how we're handling it today...?

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