Mixers no longer work. The coin analytics companies can identify and see past mixers now and have been for awhile. If you need to anonymize bitcoin you have to jump to an opaque blockchain and back, and take care on how you do it to avoid timing analysis.
wrong..
chainalysis.com uses input, outputs, and timing to map. If you have no change outputs as inputs they fall back to timing and back-data behaviour patterns.. They are forced to eventually attribute using exchanges through government or willful cooperation..
Nobody can map seeds or key pairs cryptographically..