Lux Relay

Cross-chain message relay for the Lux network. Two surfaces:

• vm/ — relayvm chain VM (R-Chain). Imports as a luxd plugin or standalone chain. Runs the consensus + state layer for verified cross-chain channels and messages. Source of truth.
• cmd/relayd/ — standalone operator daemon. Polls source chains for events, packages them as R-Chain SendMessage calls, watches for verified messages, and dispatches to destinations. Same operational shape as mpcd and kms — no luxd validator required.

The chain VM is the security boundary; relayd is just the courier.

relayd

RELAYD_OPERATOR_ID=NodeID-... \
RELAYD_RELAYVM_RPC=http://127.0.0.1:9650/ext/bc/R/rpc \
relayd

HTTP endpoints (default :7700):

Path	Method	Purpose
/v1/health	GET	health probe
/v1/status	GET	uptime, channel count, message counters
/v1/channels	GET	list R-Chain channels tracked by this operator
/v1/messages?state=pending	GET	list in-flight messages
/v1/relay/trigger	POST	re-attempt delivery of a specific message ID

State persists at $RELAYD_DATA_DIR/relay.state (JSON).

relayvm (chain VM)

vm/ is the canonical relay VM. Import path github.com/luxfi/relay/vm. The luxd plugin wrapper lives in ~/work/lux/chains/relayvm/ and just re-exports this package.

Architecture

┌─ source chain ─┐         ┌─ R-Chain (relayvm) ─┐         ┌─ dest chain ─┐
│ Outbound event │ ─poll─► │ SendMessage         │ ─poll─► │ Inbound call │
└────────────────┘         │ GetVerifiedMessage  │         └──────────────┘
                           └─ relayd operator ───┘

Recipients carried as bytes32 so the same primitive covers EVM (address as uint160 in low bytes) and Bitcoin / OP_NET (32-byte Taproot x-only pubkey) uniformly. For non-EVM destinations, relayd hands the verified payload to luxfi/mpc for FROST/Taproot threshold signing.