Offline anonymous electronic money systems and their cryptographical base What anonymous offline electronic money systems exist and what are they based on? I know only one currently - eCash, based on RSA blind signatures.
http://faircash.org/technology/teleportation.html


  Due to the Digital Coin concept, a value transfer between payer and payee is realized by transferring ownership of the eCoin. An essential part is the way how this transfer is conducted: Following the cash paradigm, it needs to be done peer-to-peer and offline in a repeatable way. Such a transfer is called teleportation.