Bitcoin P2P e-cash paper
Satoshi Nakamoto satoshi at vistomail.com
Fri Nov 14 2008

Ray Dillinger (Bear) wrote:
> When a coin is spent, the buyer and seller digitally sign a (blinded)
> transaction record.

Only the buyer signs, and there's no blinding.
Satoshi Nakamoto

https://www.metzdowd.com/pipermail/cryptography/2008-November/014858.html