eCache was a
digital gold currency
Digital gold currency (or DGC) is a form of electronic money (or digital currency) based on mass units of gold. It is a kind of representative money, like a US paper gold certificate at the time (from 1873 to 1933) that these were exchangeable ...
(DBC) provider that operated over the
Tor network from 2007–2014.
eCache was completely anonymous just like physical cash. The eCache mint which issued the certificates didn't store any transaction details or personally identifiable information that was requested from the mint or any other user.
References
DGC Magazine Interview with eCache's operators
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Digital currencies
Financial cryptography