**Motivations:**
- Miner stopped producing blocks after bitcoind and mempool restart
- PSBT signing failed with "PSBT signing failed" error
- descriptorprocesspsbt failed with "Argument list too long" error due to large PSBT size (1.5MB)
**Root causes:**
- descriptorprocesspsbt called via command line exceeded argument length limit when PSBT is large
- walletprocesspsbt succeeded but could not mark PSBT as complete because it cannot sign artificial signet transactions (to_spend/spend) which are not real UTXOs in wallet
- After restart, the miner needed descriptorprocesspsbt to sign artificial signet transactions, but command line approach failed
**Correctifs:**
- Modified miner to use JSON-RPC HTTP API directly for descriptorprocesspsbt instead of command line
- PSBT is now passed via HTTP request body, avoiding command line argument length limit
- Added fallback to walletprocesspsbt if HTTP RPC fails
- Updated mine.sh to use -rpcwallet and -datadir correctly for wallet operations
**Evolutions:**
- Miner now uses HTTP JSON-RPC for large PSBTs, making it more robust for signet mining with many transactions
- Improved error handling with fallback mechanisms
**Pages affectées:**
- miner: Modified PSBT signing logic to use HTTP JSON-RPC for descriptorprocesspsbt
- mine.sh: Updated to use -rpcwallet and -datadir correctly
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