Unlike some other elliptic curve stuff, they are represented as patent free by the author. Refer to http://ed25519.cr.yp.to/ for further details.
I think WinSCP should support these as soon as possible.
But Ed25519 is not in PuTTY 0.65.Hello!
PuTTY was released 0.65 some time ago. Do you plan to make support of ed25519 keys and other modern cryptographic methods? For now isn't possible to connect to some servers from WinSCP and Netbox (Far Manager plugin https://github.com/michaellukashov/Far-NetBox/)
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