StatechainJS: Like Ecash but If Operator Goes Down You Can Recover Your Sats

"Unlike ecash mints, which have full custody of your money, the only way a statechain operator can rob you is through a doublespend – they can help someone "take back" money that they sent you. But if some authority figure demanded that a statechain operator confiscate coins from folks who don't kyc, they cannot help with that except if they first prepared a doublespend attack on every user," said Super Testnet.

https://www.nobsbitcoin.com/statechainjs-demo/