I edited the firsts post of this blog that provides an overview of all methods. There are now 6 in total. I added @renzokuken SlateStore solution and my Buddy System.
After reading Renzokuken’s method I see they are very similar with SlateStore having the advantage of only being a third party in the transaction but with disadvantage of requiring a last round of interaction with the Sender to finalize. The BuddySystem has the advantage of being Sign and forget for the sender but has as disadvantage the use of this know public-key.
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select a solution that is truly decentralized and private by design
and we need solution for mobile wallets and coin-swaps mixers and atomic swaps