The problem with dropping Bitcoin Stamps UTXOs from the UTXO set without a consensus change is that a clever use of steganography could cause one of those otherwise unspendable outputs to be spendable, thus causing a fork between those nodes that adopted the Stamp pruning method and those that did not once one of those steganographic Stamps is spent. Though this is unlikely, it is still technically possible, and I would not put it past the denizens of the Internet to stir up trouble just for its own sake.

On Friday, December 12, 2025 at 6:49:41 PM UTC-5 Greg Maxwell wrote:

On Fri, Dec 12, 2025 at 9:26 PM Jonathan Voss <k98...@gmail.com> wrote:
Since the Bitcoin Stamps outputs are already unspendable, it makes perfect sense to mark and drop them from the UTXO set.

There is no consensus change involved in not storing a provably unspendable output, it's just an implementation detail with no interoperability implications and doesn't need a BIP. Bitcoin core has long done so for several types of unspendable outputs, e.g. outputs over 10kb and ones starting with OP_RETURN.