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Review 2, N7, the care it raised: a joining node's empty document took
as the first epoch's root whatever dependency-less change came first,
from whichever peer it joined through; the first epoch's ID is all
zeros, so nothing pinned it. A remake's epoch has its ID, the snapshot
change's hash, which the rules hold its root to.
* Every node names its epoch's root in HELLO and HELLO_REPLY (the
epoch's ID for a remake's, its genesis change for the first; wire
version 45). A node whose document starts from another root of the
same epoch refuses the handshake, logging it: another history under
the swarm's ID, a forged root or a genesis started again.
* A joining node with an empty document takes as its root only the one
it was given (--genesis-root, new), else the one its peers name, and
none while they name different ones (access::screen::RootPin, kept
in Screening across documents): one peer hands it another root only
if it is all the joiner hears, or never, with --genesis-root. A root
refused is listed with the refused, what builds on it with it.
* The genesis node logs the root (`The swarm's root`); GET
/admin/epochs shows it (`root`).
A genesis started again under a remembered swarm ID used to merge with
the nodes of it still running; they now refuse it (another root), and
the docs say to join them with seeds instead.
The epoch's identity stays as it is (generation 0 all zeros): records
and epoch metadata name it so, and every comparison of epochs with
them.
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Review 3.1, part of finding 12: a signed value's payload bound path,
user, time and prev, but not the swarm. A user with the same name and
key in two swarms could have an envelope replayed from one into the
other, wherever the path holds no envelope yet (prev "").
The payload now names the swarm (`swarm`), and a node takes an envelope
only for its own. /auth/whoami says the swarm, and continuum-signed and
the example in api.md sign it. Wire version 44: nodes before this
refuse such envelopes, and those after refuse the old ones.
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Review finding 7, second part: a record carried into a new epoch whole
(proposal and decision in one change) was taken from any member, for
any remake ID. A member could write a forged record, decision included,
for a fresh ID in a single change.
The snapshot's epoch metadata now names the remake's coordinator, as
the quorum built it. The carried-record exception holds only in a
later epoch, only for the remake that made it, and only from the
coordinator its snapshot names, where there is no record yet. Wire
version 43: the snapshot, and so the epoch ID, changes.
The review suggested carrying the record inside the snapshot instead.
The snapshot can't hold the decision, which names the snapshot's own
hash. So the snapshot vouches for who may carry the record instead.
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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 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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Sync messages carry, for each actor's writes, the latest signature the
sender checked; the receiver checks it once it holds the change.
Auth plan M5.
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The dashboard reads every member's links from the members themselves;
LINKS and LINKS_REPLY, swarm::links and their wire tags go (wire
version bumped). Nodes the browser can't reach are drawn from what the
reachable ones measure.
Auth plan M3.
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Each tick's messages of a subscribed node, listed in the console with
this node's own, from its own stream.
Auth plan M3 (live data from every reachable node).
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A neighbour now answers an announcement only if it lacks some of the
announced heads. Heads that merely differ are no longer enough, since
they do while writes go on. The check reads the document, so it runs
off the message consumer, as the pull check already does.
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