Having calculated the shared secret and blinded the public keys using it, she then send Bob the ecash token, including the ephemeral PUBLIC KEY (E) that she created.
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Now Bob can use the magic of ECDH... he takes his private key (p) and the ephemeral public key that Alice sent with the ecash (E), and he can calculate the SAME shared secret!
He can now use that shared secret to derive a private key to unlock the ecash.
