It was recently accepted for standardization by nist Monolithic tree but of k trees of height log t. There is a unique fors tree below each of the $2^ {63}$ level 0 xmss leaf nodes
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That is, each leaf node signs a different fors public key (and each node only signs its assigned public key).
Now, as we generate bitmasks pseudorandomly, this has no influence on public key size
A fors key pair does not consist of a single
