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Signatures sent on their own (SIGNATURES, every second, to each peer
not sent them yet) flooded every link: a signature made after its
change left, or one that came with changes, went to every neighbour,
whether or not it got the change along with its signature elsewhere.
With every change of a node signed as it leaves (1217) and signatures
going where their changes go (1218), none is left for them to carry:
the message, its task and its traffic counter go (wire version 46).
Signatures waiting for their changes are offered as before when sync
messages bring them, and the changes waiting for signatures judged
again with the next batch.
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A node signed its changes no rule signs a while after them (--sign-every
1s): the change left at once, unsigned, and its signature followed on
its own a second later, to every neighbour, over every link. A few
writes made a cascade of SIGNATURES. Under a policy requiring
signatures it signed every change as it was made instead.
A node now signs its latest change, if no signature vouches for it, as
a sync message takes it (--sign-every sent, the default): the
signature leaves in the same message, and goes where the change goes.
One signature per message, however many changes it carries, each
vouching for those before it: a slow writer's every change is signed,
a fast writer's batches are, at no threshold to pick. A policy
requiring signatures signs what is sent too, even with `none`. `all`
still signs every change as it is made; changes to protocol data,
listed paths and ?signed=true writes are signed as they are made, as
before. The interval, and the task signing on it, go.
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