Relay Server

The relay server is a private Node.js TypeScript package under relay-server/. It has three responsibilities:

Server files

Source	Responsibility
`relay-server/src/server.ts`	HTTP server, WebSocket server, session lifecycle, CORS, health/status endpoints, cosigner and sponsor endpoints.
`relay-server/src/cosigner.ts`	Register cosigner share, report safe status, join signing sessions, produce signature shares.
`relay-server/src/frost.ts`	Load FROST WASM for server-side cosigner signing.
`relay-server/src/secureStorage.ts`	Encrypted JSON state storage and legacy state migration.
`relay-server/src/pqcSponsor.ts`	PQC wallet init sponsorship, payer keypair loading, RPC submission, usage limits.

Setting	Source constant
Default port	`PORT`, default `8765`
Session TTL	`SESSION_TTL_MS`, 10 minutes
Max sessions	`MAX_SESSIONS`, 100
Max participants per session	`MAX_PARTICIPANTS_PER_SESSION`, 10
Member stale window	`MEMBER_STALE_MS`, 45 seconds

Variable	Purpose
`PORT`	Relay HTTP/WebSocket port.
`COSIGNER_STORE_PATH`	Optional path for encrypted cosigner records.
`VAULKYRIE_RELAY_SECRET`	Secret material for encrypted relay state.
`PQC_SPONSOR_STORE_PATH`	Optional path for PQC sponsor usage records.
`PQC_SPONSOR_KEYPAIR_PATH`	Optional sponsor payer keypair path.
`PQC_SPONSOR_FREE_LIMIT`	Free sponsorship limit.
`PQC_SPONSOR_TOKEN`	Token required for sponsor endpoints when configured.

cd relay-server
npm install
npm run build
npm start