feat: local PoW via nano-rspow with remote fallback#2
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Integrate nano-rspow as the default PoW backend for Nano blocks, replacing the previous 100% remote RPC approach. - Add nano-rspow (CPU via rayon) behind 'local-pow' feature (default on) - PoW mode defaults to 'auto': local first, remote RPC fallback - NANO_POW_MODE env var: 'auto' (default), 'local', 'remote' - NANO_WORK_URL continues to provide additional remote endpoints - Remove hardcoded FALLBACK_WORK_URL (rpc.nano.to) - Downstream can opt out with --no-default-features
- Remove hardcoded SEND_DIFFICULTY/RECEIVE_DIFFICULTY hex constants - Re-export EPOCH2_SEND/EPOCH2_RECEIVE from nano_rspow::thresholds (with fallback consts when local-pow feature is disabled) - work_generate now accepts u64 threshold, converts to hex for RPC - Rename NANO_POW_MODE to NANO_WORK_MODE to align with NANO_WORK_URL
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Summary
NANO_WORK_MODEenv:auto(default),local,remoteNANO_WORK_URLsupplies additional remote endpointsnano_rspow::thresholds(no duplication)local-pow(default on), opt out with--no-default-featuresFiles
ows/crates/ows-lib/Cargo.toml— addnano-rspowdep +local-powfeatureows/crates/ows-lib/src/nano_rpc.rs— rewritework_generate, removeFALLBACK_WORK_URLows/crates/ows-lib/src/ops.rs— usenano_rpc::EPOCH2_SEND/RECEIVEthresholds