Trustless mining pools
I've been working on an experimental branch of mkp224o that allows mining keys on untrusted devices without exposing the final private key to them. Onionmine already supports remote mining - adding support for this branch (or helping to get it merged) would make it safer to mine on third party servers.
https://github.com/cathugger/mkp224o/issues/60
https://github.com/cathugger/mkp224o/pull/98
The code (and overall method) still hasn't been reviewed by a real cryptographer, which is the main issue blocking it from being merged upstream. The basic idea is based on Bitcoin's Vanity Pool, but there are some Ed25519-specific quirks.