PR #1 of the multi-device roadmap. Adds per-device X25519 keys registered
on-chain so senders can fan out envelopes across all of a recipient's
physical devices — fixes the single-device limitation where a second
phone / desktop loses messages as soon as the first one reads them.
Chain (blockchain/):
- New event types LINK_DEVICE / UNLINK_DEVICE, signed by the identity's
master Ed25519.
- LinkDevicePayload {x25519_pub_key, device_name} +
UnlinkDevicePayload {x25519_pub_key} on the wire.
- State: prefixDevice + x25519_pub → DeviceRecord{owner, name,
added_at, revoked_at?}; reverse index prefixDevicesByOwner for
O(k) listing. Revoke is a soft-delete — the row stays as a visible
tombstone so offline clients can detect their own revocation and
wipe local state.
- MaxDevicesPerOwner = 10 slot cap; MaxDeviceNameLen = 64.
- Strict lowercase-hex validation on x25519_pub so clients can't
desync on letter case.
- Same-owner re-link is a rename/refresh (recreates reverse index too
— needed after a revoke).
- Chain.DevicesOf(master_pub) returns the active records; empty slice
for legacy identities so senders can fall back to IdentityInfo.X25519Pub.
HTTP (node/):
- GET /api/devices/{master_pub_or_addr} — returns {master_pub, count,
devices[]}. Revoked records filtered out.
- /api/identity/{pub} gains `device_count` so senders can decide
upfront whether to fan out or take the legacy path.
Tests (blockchain/devices_test.go):
- Happy paths (1, 3 devices), foreign-owner rejection, same-owner
refresh after revoke, unlink removes from active set,
foreign-signer unlink rejection, idempotent double-unlink,
malformed pub/name rejection, MaxDevices cap + recovery after
unlink frees a slot, empty list for unknown master.
Also in this commit:
- deploy/single/join.sh — convenience script operators have been
iterating on in this session (joiner-node bring-up + firewall
port patching + Caddy opt-out).
- client-app/app.json — `usesCleartextTraffic: true` on Android so
installed APKs can talk to http:// dev nodes without TLS.
See docs/ROADMAP.md for PRs #2..#4 (client fan-out, pairing flow,
desktop Electron shell).
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