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  "map_content": "Phase 4 \u2014 App/wallet messaging and interop hooks\n- Define the app\u2013wallet interface that your clients will use (e.g., capability discovery, request/response schema, and signing). Use BKDS child keys for request authentication and per-context signatures.\n- Include metadata pointers (context IDs, invoice refs) in payment requests/responses so recovery does not rely on wallet-local state alone.\n- Support zero-conf/P2P overlays if that\u2019s part of your BRC100 target: integrate broadcaster/miner APIs and your double-spend monitoring.",
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