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How come we only need to generate the first tree in each layer in XMSS MT

to compute the top layer tree, you need to know the root of each L tree, which involves computing the whole L tree below each leaf. You need to compute the entire top level tree, which involves ...
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Signing a hash of file vs signing a file

Given person B only has the public key, file, signature and the hash, would verifying the signature using the public key be sufficient to prove person A signed the actual file? Person B does not need ...
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