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# Looking for things to hack on? #
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I've marked things as simple if you want something easy to work on!
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## Cleanups ##
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* Wean off openssl's -lcrypto
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* (simple) use libsodium for all RNG
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* (simple) use libbase58
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* Remove our specific libsecp256k1 in secp256k1/ and use the installed one.
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* Implement `sig_valid`, using `secp256k1_ecdsa_signature_normalize`
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* Use `secp256k1_ecdsa_signature_parse_compact`/`_serialize_compact` in `signature_to_proto`
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## Minor improvements ##
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* Optimize `bitcoind_poll_transactions` not to list all transactions every time
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* Make `json_get_params` fail if unknown parameters are specified by user.
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* Print backtrace in `log_crash`
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* Support locktime in blocks in `accept_pkt_open`, `accept_pkt_htlc_add`, `commit_tx_depth`
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* Get bitcoind's idea of time for `commit_tx_depth`, not our wall clock.
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* When unpacking a packet, reject any with an unknown odd-numbered field as per BOLT #2.
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* Provide details (string) when a command fails because state() returns CMD_FAIL
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* logging: add `log_struct()` for common structs.
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* `state_single` should only kill the specific peer when it enters an error state.
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* Limit total number of peers in `new_peer`, or at least in `peer_connected_in`.
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* logging: add IO logging for peers.
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* implement on-chain HTLCs correctly (`peer_watch_our_htlc_outputs` etc in peer.c).
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* Add `history` RPC command which shows all prior commit txs.
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* Improve `getpeers` to show status of peers when connecting, DNS lookups etc.
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* Add pings to protocol
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* Timeout a peer if they don't respond in a given time (eg. 2 pings)
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* Add timers to drop peer if we approach timeout for HTLCs and they're still
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uncommitted to closing it (see BOLT #2 "Risks With HTLC Timeouts").
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## Testing: ##
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* Add more unit tests in bitcoin/test.
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* Test more scenarios with daemon/test/test.sh
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* Implement compile-time crypto-free mode
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* Implement canned conversation files for fuzz testing (eg AFL).
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* Write canned input/output test cases for various conversations, and
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include them in a form suitable for other implementations to test.
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## Major improvements: ##
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* Use dynamic fee calculation for initial commitment fee rate.
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* (MAJOR) Implement fee renegotiation acceptance.
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* (MAJOR) Implement fee renegotiation as fee rate changes.
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* Don't fail funding if fees insufficient, fall back as per BOLT #2.
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* (MAJOR) Do proper close, still allowing ongoing HTLCs to resolve.
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* (MAJOR) Use segregated witness for all transactions.
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* (MAJOR) Implement reconnection.
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* Save preimages in shachain.
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* (MAJOR) Implement persistence.
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* (MAJOR) Implement onion
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* (MAJOR) Implement routing
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* (MAJOR) Implement failure messages
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## Other ##
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* Grep for other FIXMEs and fix one :)
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* Look on https://github.com/ElementsProject/lightning/issues
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Happy hacking!<br>
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Rusty.
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