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If I only need a small number of signatures (perhaps $2^{10}$) for the lifetime of my key pair, how would I calculate the consequent signature size?

Unfortunately managing state for an LMS or XMSS signature would be an issue, so that's not an option.

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    $\begingroup$ That computation is surprisingly nontrivial. $\endgroup$ – poncho Aug 6 at 15:30

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