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What the bank does is keep a list of all spent serial numbers, not all issued ones (since it doesn't know those). That way it can detect double spending.

Correct me if I'm wrong: It means that the weakest point of the digital cash chain is the server. If the server's database is tampered with, or lost, then, the double-spending can be done (in case of loss, if ever the server is put back online) Does that means that for all practical purposes, a server should be run from a vault with security comparable to a big money repository? JFA -----BEGIN PGP SIGNATURE----- Version: 2.6.2i iQEVAwUBMW1dnsiycyXFit0NAQFpPQf6A/IvZWumneiGU1IERxbs/udunwFWHWVG p+rbAK9h7bDYG+6NcFCIJp97n4MGfH8/+bbPLV4eIuv+5eyTKRkB+1IdOkVNUhEq LGcKGN1iAScQvLxj+cM/3nthAhDxdaMBXmyaylnphgqh9slKJg7FppWpBfLI56nt YYZJ69ThyYMVCN/g9o5G0zbzYefKFOzV/0lbxaGUn0G/KoKbURMut1NlMdfmhmqw BbTd50ae8LVWLjxlVs5Gi5Ui9Loa2DKlSR5PIp1vlFDSk1UBAjTbbK8fSKVhkEFn thI+YXLifA73LOJNdBWwvneTWyy+kdVxHBSDVFEXH2HMsR4LYeHF1g== =JxPP -----END PGP SIGNATURE-----