- Add ShareForUser field to ParticipateKeygenOutput
- Implement role-based share handling (persistent/delegate/temporary)
- Add in-memory share cache with 15-minute TTL for delegate parties
- Add GET /api/v1/sessions/:session_id/user-share endpoint for one-time share retrieval
- Shares from delegate parties are NOT saved to database
- Add comprehensive Delegate Party implementation guide
This implements hybrid custody model similar to Fireblocks and ZenGo:
- Persistent parties: shares stored in server database
- Delegate parties: shares returned to user, deleted from memory after retrieval
🤖 Generated with Claude Code
