I think stupid question, but I am wondering is there way to get the cashu ecash sats to onchain btc? Something like submarine swaps?
If you want to write a parser for Cashu tokens:
1) Cashu V3 tokens start with the prefix `cashuA.....`
2) The part after that can be base64-decoded (urlsafe)
3) Get your user's Lightning address and send them to
`https://redeem.cashu.me&token=
Discussion
not yet, the easiest way would be to go over Lightning to on-chain swaps and pay the lightning invoice via Cashu. I don't know how well it would work with a hodl invoice though.