Great Nostr tool (by #[0]) converting to and from hex. Lookup nip05 address and lots more goodness. nostrstuff.com
Sound Money
soundmoney@no.str.cr
npub1pk37...gwnd
777777! You bewty!

Great explainer of elliptic curve cryptography (ecc). If you have an ecc explainer that's helped you, please share. 

Elliptic Curve Cryptography for Noobs (Part 1)
Written by a Noob
They're back
#austriches
