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When it comes to stateful schemes, would you really need to use a Merkle tree?

Couldn't you sign the hash of the message concatenated to the hash of the new public key?

New public key: hash(hash(message) || hash(WOTS+/lamport public key))

Then for every new signature you include the previous signature(s) (without the messages).

Is the only downside of this the growing signature size or is there a security fault?

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  • $\begingroup$ There is a sort of security leak in that you must attach the hashes for all previously-signed files to any new signature. (But also, yeah, a signature that grows like that is horrendous outside of an academic context.) $\endgroup$ Commented Jun 23, 2022 at 15:29
  • $\begingroup$ (Possible mitigation to this leak: salting messages before you sign them) $\endgroup$ Commented Jun 23, 2022 at 15:31

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This is how stealth addresses are generated in Haircomb, you hash garbage values together with existing public key, to get a new public key. The garbage values have a specific format, that is of liquidity stack which pays 0 coins to the garbage address.

It isn't really a signature scheme, but rather a commit-reveal commitment scheme.

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