**Motivations:**
- Anchor API requests were being aborted with 'This operation was aborted' error
- API anchorage had performance issues causing long response times (30-60s)
- Mutex could block indefinitely if a previous request crashed or timed out
**Root causes:**
- No timeout on mutex acquisition, causing indefinite blocking
- Sequential RPC calls (8+ getNewAddress calls) instead of parallel
- Expensive fee calculation making N RPC calls (one per input) instead of using known UTXO amounts
- RPC timeout too short (30s) for slow Bitcoin node operations
- No guarantee of mutex release in error cases
**Correctifs:**
- Added 180s timeout on mutex acquisition with Promise.race() to prevent indefinite blocking
- Parallelized getNewAddress() calls with Promise.all() (9 sequential calls → 1 parallel call)
- Optimized fee calculation to use known UTXO amounts instead of getRawTransaction() per input (saves N RPC calls, up to 20+)
- Increased RPC timeout from 30s to 120s in .env.example
- Added finally block to guarantee mutex release in all cases (success, error, timeout)
- Added timeout and explicit error handling in api-filigrane callAnchorAPI() with AbortController (120s timeout)
**Evolutions:**
- Performance improvement: execution time reduced from ~30-60s to ~10-20s
- RPC calls reduction: from ~15-35 calls to ~8-12 calls per anchor transaction
- Better resilience: mutex cannot block indefinitely anymore
- Improved error messages with explicit timeout/abort information
**Pages affectées:**
- api-anchorage/src/bitcoin-rpc.js: mutex timeout, parallel address generation, optimized fee calculation, finally block
- api-anchorage/.env.example: increased RPC timeout to 120s
- api-filigrane/src/routes/watermark.js: timeout and error handling for anchor API calls
- fixKnowledge/api-filigrane-anchor-request-aborted.md: documentation of issues and fixes
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