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Review 2.2: swap_document forgot every signature. After dropping
changes taken unjudged (or a rejoin into the same epoch), the node
could vouch for none of the changes it kept: under signatures required,
those building on an actor waited for that actor's next signature, and
for an actor that stopped writing, forever.
Signatures::kept_for keeps the signatures of the changes the new
document holds, checks each actor's latest again, and keeps those
waiting for their changes. This node's replayed changes are signed at
once, as before.
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A REFUSALS naming the swarm's first change made the node receiving it
judge that change again in a document that isn't empty, refuse it as
"a change without dependencies that isn't the epoch's root", and drop
it with everything built on it: its whole document.
The first epoch's root is now the first change a document holds, as it
comes to an empty one or as it is in one; a change judged again on a
peer's word is never refused for having no dependencies; and
drop_taken refuses to drop an epoch's root, or anything that would
leave nothing kept, logging an error instead.
Review finding 1 (critical).
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A node refusing changes a peer brought tells it which broke a rule; the
peer judges them itself, and if its rules refuse them too, drops them
with all built on them (its document forked without them, a fresh
actor), quarantining its own writes among them. Wire version 42.
Auth plan M6 (rejoin on taint).
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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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_continuum/access/policy ({"version": 1}) has every node screen every
change it receives, on every path changes come in. A policy a node
doesn't know stops its writes through the API. GET /admin/refused.
Auth plan M6.
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Forget records and released quarantines name the user who made them,
so they are judged by its capabilities.
Auth plan M6.
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Every node signs the changes it commits with its node key, an Ed25519
signature over the change's hash, kept beside the document. One
signature on an actor's latest change vouches for its earlier ones.
Protocol data and paths listed in _continuum/access/signed are signed,
and writes with ?signed=true.
Auth plan M5.
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This ensures that stale reads show every write that was answered.
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The stamp is the only lock-free epoch label.
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This allows a lot of operations to drop mut.
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