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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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Review 3, R1: what a node received was vouched for only while its own
document's policy required signatures. A joiner's first sync, and
every node's message bringing `required`, went in by the rules alone:
a malicious first peer could plant changes under other members' actors
at their next seqs, their real ones then failing as duplicates for
good.
The signatures a message carries are always offered now, and the
screen always has them: a change waits for one where the policy at the
heads it is judged at requires it (rules::Reads::required, read once
per heads), whatever the receiving document holds. Changes written
under a policy not requiring signatures wait for none, as on every
other node; the check for forged changes runs always. Changes waiting
for a signature are judged again whenever signatures come.
The test of signatures required now takes the history into an empty
document; a new one takes changes written under a policy not requiring
them without any.
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A refused change is remembered by its hash: offered again it is refused
without decoding, judging or logging, so is one built on it, and a peer
offering nothing else is answered later each time, up to a minute.
Auth plan M6 (re-sending).
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"signatures": "required": a change counts only once a signature by its
committer vouches for it, and waits until then; every node then signs
every change it makes.
Auth plan M6.
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Signatures no sync message took go on their own within a second, to
each peer not sent them yet (wire version bumped).
Auth plan M5.
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