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# Electrum
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* Poll mempool after transaction broadcast
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* Support TLS (via https://docs.rs/rustls/)
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* Snapshot DB after successful indexing - and run queries on the latest snapshot
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* Update height to -1 for txns with any [unconfirmed input](https://electrumx.readthedocs.io/en/latest/protocol-basics.html#status)
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* Limit mempool TXs (e.g. by fee rate) when mempool is large
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# Bitcoind
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* Stream blocks (instead batching RPCs)
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* Use nTx from [getblockheader RPC](https://github.com/bitcoin/bitcoin/pull/13451) for better batching
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* Handle bitcoind connection failures - instead of crashing
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* Add getrawtransactions() API (for RPC batching)
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# Performance
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* Use rayon for faster multi-block indexing on multi-core systems
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* Experiment with [sled](https://github.com/spacejam/sled) DB
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# Rust
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* Use Bytes instead of Vec[u8] when possible
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* Return errors instead of panics
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* Use generators instead of vectors
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