{
 "number": 35302,
 "input_hash": "96e21b02c106f4f1",
 "model": "openrouter/google/gemini-3.8-flash",
 "batch": false,
 "created": "2026-09-17T15:52:45+00:00",
 "provider": "Google",
 "stop_reason": "end_turn",
 "usage": {
  "input_tokens": 30845,
  "cache_creation_input_tokens": 0,
  "cache_read_input_tokens": 0,
  "output_tokens": 5893
 },
 "cost_usd": 0.0452325,
 "error": null,
 "result": {
  "display": {
   "goal": [
    "Enable the wallet to send to BIP 352 Silent Payment addresses",
    "Prevent address reuse and improve on-chain privacy without out-of-band communication"
   ],
   "reviewability": [
    "Needs rebase against current master and prerequisite PR 35301"
   ],
   "agreement": [
    "Concept support with all reviewer suggestions addressed (rkrux, theStack)"
   ],
   "categories": [
    {
     "name": "wallet",
     "why": [
      "P2 because it introduces a major user-facing privacy improvement by enabling BIP 352 sending.",
      "Substantially updates coin selection, key derivation, and transaction replacement to support silent payments."
     ]
    },
    {
     "name": "utils",
     "why": [
      "P3 because it adds BIP 352 cryptographic helper functions in common wrapping libsecp256k1.",
      "Provides reusable primitives intended for both wallet spending and future indexers."
     ]
    }
   ]
  },
  "summary": "Implements BIP 352 Silent Payments sending support in the Bitcoin Core wallet. It introduces address parsing and encoding for silent payments destinations, wraps libsecp256k1 silentpayments routines in common utilities, updates coin selection to ensure eligible inputs for shared secret derivation, and handles recipient script generation and RBF recomputation.",
  "problem": "Traditional Bitcoin payments encourage address reuse or require interactive setup between sender and recipient, compromising user privacy on-chain. Silent payments allow senders to generate unique, unlinked taproot outputs from a recipient's static public address.",
  "discussion": {
   "open_concerns": [],
   "resolved_concerns": [
    "theStack pointed out missing explicit checks against TxoutType enumeration in scriptpubkeyman and suggested code simplifications, which were adopted.",
    "rkrux suggested testing bumpfee output replacement, context managers, and removing deprecated createwallet parameters, which were implemented."
   ],
   "author_status": "active through July 2026 addressing test review, currently pending rebase"
  },
  "reviewability": {
   "state": "Stale",
   "label": "Needs rebase",
   "reason": "The PR has merge conflicts with master and is explicitly dependent on unmerged prerequisite PR 35301."
  },
  "agreement": {
   "state": "Positive",
   "summary": "Concept ACK from rkrux; code and test feedback from theStack and rkrux was resolved.",
   "reason": "Reviewers have expressed concept support and reviewed code and functional tests. All raised issues have been addressed by the author across subsequent updates.",
   "evidence": [
    "rkrux gave Concept ACK (2026-05-20)",
    "theStack gave inline comments on scriptpubkeyman and rpc spend which were addressed (2026-05-23, 2026-06-07)",
    "rkrux reviewed functional tests and suggested coverage for bumpfee and test cleanup, addressed by author (2026-06-24 to 2026-07-01)"
   ]
  },
  "dependencies": {
   "depends_on": [
    35301
   ],
   "enables": [
    "Silent Payments milestone tracking issue #28536",
    "Silent Payments receiving #32966"
   ]
  },
  "categories": [
   {
    "name": "wallet",
    "member": true,
    "evidence": "Extensively modifies wallet coin selection, spend, transaction construction, and wallet database records to support silent payments sending.",
    "band": "P2",
    "reason_tag": "new feature",
    "score": 0.7,
    "factors": {
     "security_stability": 1,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 3,
     "leverage": 2
    },
    "rationale": "Adds the sending side of BIP 352 Silent Payments, delivering a major privacy feature for wallet users and advancing the broader Silent Payments project tracked in issue #28536."
   },
   {
    "name": "utils",
    "member": true,
    "evidence": "Adds src/common/bip352.cpp and src/common/bip352.h wrapping libsecp256k1 silentpayments routines for shared use across the node and wallet.",
    "band": "P3",
    "reason_tag": "new feature",
    "score": 0.45,
    "factors": {
     "security_stability": 1,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 2,
     "leverage": 2
    },
    "rationale": "Introduces shared BIP 352 cryptographic wrappers in src/common/ designed to support wallet operations, RPCs, and potential indexing utilities."
   },
   {
    "name": "kernel",
    "member": false,
    "evidence": "Only adds silent payment HRP constants to ChainParams; does not affect the kernel API boundary or library interface.",
    "band": "Unranked",
    "reason_tag": "",
    "score": 0.0,
    "factors": {
     "security_stability": 0,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 0,
     "leverage": 0
    },
    "rationale": "Chainparams updates are purely declarative configuration and do not alter the libbitcoinkernel boundary."
   },
   {
    "name": "rpc",
    "member": false,
    "evidence": "The RPC changes and scantxforsilentpayments command serve purely as wallet and test support rather than changes to core RPC framework infrastructure.",
    "band": "Unranked",
    "reason_tag": "",
    "score": 0.0,
    "factors": {
     "security_stability": 0,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 0,
     "leverage": 0
    },
    "rationale": "Wallet-related RPC changes and test helpers belong to wallet and test scope rather than the RPC infrastructure category."
   },
   {
    "name": "tests",
    "member": false,
    "evidence": "The unit test vectors and functional test scripts exist specifically to validate silent payment wallet behavior rather than general testing framework infrastructure.",
    "band": "Unranked",
    "reason_tag": "",
    "score": 0.0,
    "factors": {
     "security_stability": 0,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 0,
     "leverage": 0
    },
    "rationale": "Tests validating a specific domain belong to that domain's category (wallet)."
   }
  ],
  "confidence": "high",
  "uncertainties": [],
  "needs": [],
  "card": "PR 35302 implements sending support for BIP 352 Silent Payments in the Bitcoin Core wallet. It enables senders to pay static silent payment addresses without on-chain address reuse by deriving taproot outputs from selected inputs and recipient public keys, alongside coin selection and RBF handling. This constitutes a major milestone for the project's silent payments roadmap (#28536). The PR is currently marked draft, needs a rebase against master, and relies on prerequisite PR 35301."
 },
 "raw_text": null
}