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Scrit (also referred to as Scrit1), which is referenced as "prior art" for Fedimint, has methods for "half-offline" (i.e., only sender online, or only recipient online), and offline (i.e., both offline, and could be done via paper / QR codes even).
"Scrit: A distributed untraceable electronic cash system" https://github.com/scritcash/scrit-whitepaper/blob/master/scrit-whitepaper.pdf
The Fedimint homepage also refers to "Scrit2" with having "receiver- and sender-initiated half-offline transactions".
And along these lines:
Transferable E-cash: A Cleaner Model and the First Practical Instantiation https://eprint.iacr.org/2020/1400.pdf
And there are a number of redeemable code / voucher / etc approaches, including:
LNCash https://ln.cash/how
Scrit (also referred to as Scrit1), which is referenced as "prior art" for Fedimint, has methods for "half-offline" (i.e., only sender online, or only recipient online), and offline (i.e., both offline, and could be done via paper / QR codes even).
"Scrit: A distributed untraceable electronic cash system" https://github.com/scritcash/scrit-whitepaper/blob/master/scrit-whitepaper.pdf
The Fedimint homepage also refers to "Scrit2" with having "receiver- and sender-initiated half-offline transactions".
And along these lines:
Transferable E-cash: A Cleaner Model and the First Practical Instantiation https://eprint.iacr.org/2020/1400.pdf
And there are a number of redeemable code / voucher / etc approaches, including:
LNCash https://ln.cash/how