Sanders sketches a solution, but notes that it has downsides. He also notes how the problem could be solved using Chia’s coinid feature, which appears to be similar to John Law’s 2021 idea for Inherited Identifiers (IIDs). Jeremy Rubin replied with a link to his proposal last year for muon outputs that must be spent in the same block as the transaction that created them, showing how they could contribute to a solution. Sanders mentions, and Anthony Towns expands on, the coinid feature from the Chia blockchain, showing how it could reduce the data required to a constant amount. Salvatore Ingala posted about a similar mechanism using OP_CAT that he learned about from developer Rijndael, who later provided details. Brandon Black described an alternative type of solution—a penalty-based variant of LN-Symmetry—and cited work by Daniel Roberts about it (see next news item).