waxwing on Nostr: No, there are several variants of ecash, most based on blinded Schnorr signatures. ...

No, there are several variants of ecash, most based on blinded Schnorr signatures. Cashu uses a different algo, based a kind of blinded Diffie-Hellman, similar to that used in privacypass.
Fedimint uses blind signatures plus federated mints.