Great stuff!

Sigmanero will have 2 of the 3 necessary keys to sign transfers for extra security and to guarantee that it will always be a party to the transfers.

Doesn't holding two keys in 3/4 multisig instead of one in 2/3 increases complexity? Why wouldn't you let users settle the outcome between themselves and make Sigmanero a necessary party in the every transaction?

**The small innovation of sigmanero.org is that multi-sig wallets are auto-generated in the browser of each user, which hopefully significantly reduces the hassle of using multi-sigs. No need for command line interface (CLIs). **

Would you consider sharing this work? I imagine that can help other developers less familiars with the lover-level parts of the stack to develop against Monero.

Best of luck!