Phase 5 — Indexing, recovery, and observability - Indexer: …

Phase 5 — Indexing, recovery, and observability
- Indexer: track both legacy and BKDS keys. For BKDS, derive keys on-demand from known, deterministic context strings; avoid brute-force scans by ensuring every issued request/invoice persists its context string.
- Recovery model: to fully recover BKDS funds you need (a) master seed and (b) the list of issued context strings (or a deterministic way to recompute them from on-chain data or application logs). Store an encrypted registry of issued contexts.
- Analytics: tag UTXOs by context; expose reports for balances/spend by invoice/session/contract.