Hi folks, I was looking around into Mixers/Tumblers the other day and stumbled upon some very good research like the zk-SNARKs and TumbleBit. Two technologies that 'obfuscate' transactions, making blockchain analysis a guess fest.

My interest in the mixer is in Bitcoin forks and nothing fancy like Ethereum (which has zero-trust mixers based on zk-SNARKs like Tornado cash AFAIK) but when looking into existing online mixers they all appear to be 'send me coins and I promise I will send them back' kind of vibe.

Aren't there any zero-trust mixers for Bitcoin or Bitcoin forks? or have I been looking in the wrong direction?

Also, could multi-sig transactions with two or more participants (using a pre-defined amount of assets, ideally inputs are dividable by each other, eg, a multitude of 0.001) be used to obscure transaction histories?