Hi all, after the [completion](https://repo.getmonero.org/monero-project/ccs-proposals/-/merge_requests/256#note_15087) of my previous [Seraphis PoC CCS](https://repo.getmonero.org/monero-project/ccs-proposals/-/merge_requests/256), there are additional tasks I would like to work on. For background on this CCS, please see the links in the previous sentence.
## New tasks
These tasks will be implemented in my [seraphis_lib](https://github.com/UkoeHB/monero/tree/seraphis_lib) branch. My ultimate goal is that, once this CCS is complete, I can hand off seraphis_lib to other Monero developers who can start working on/thinking about how to get Seraphis actually used in Monero.
- Build a wallet proof-of-concept that demonstrates all the 'transaction engineering' capabilities and implementation modularity of Seraphis/Jamtis. My goal is to have unit tests representing all the main workflows possible with Seraphis, and all the main wallet implementations necessary (i.e. mock-ups of interfaces that could potentially be developed into full-fledged wallet software).
- Test out using x25519 for enote ECDH instead of ed25519, which may speed up enote scanning by a non-trivial amount (>10%).
- Add validation code and plumbing for `tx_extra` fields.
- Add tx builder plumbing for tx fees.
- Add multisig tx builders for Seraphis (with unit tests) after the master branch is updated with PR #7877.
I will also lump all the miscellaneous Monero R&D tasks that I work on into this CCS (e.g. in the last period I did a bunch of review/work on multisig security patches, among other things).
