Satoshi test — why it’s so important for buyers?

We are working on OTC market — it’s a Over The Counter market where both sides Seller and Buyer prefer to stay in a shadow. It’s not black market…Just for several reasons counter parties don’t wanna show up. Usually they are using proxy companies or using someone who is dealing behalf of Seller/Buyer. The thing is why this market is existing — someone need to cashout big amount and not get And this its difficult to make via exchange (like Binance or Coinbase — they will block your account and ask 100 papers to verify your crypto and from where you get it. With money same — if you will send 20–50–100m$ to exchange — they will block your account and will request all information from you where you get this money and also would like to see dirty underwear from your grandma etc.)

Before transaction most of the Buyers are willing to receive a satoshi from the Sellers wallet. This called Satoshi test. After this test technician guy from buyer side can check BTC wallet. Is this BTC wallet clean, not from darkweb, not flash etc. If the coins are clear — most of the buyers are ready to make transaction and transfer money to Sellers company upfront. (according to signed contract) And after seller will receive money on his company bank account — he will release coins.

This looks like easy deal. But no…Most of the Sellers or people who called themselves Sellers are rejecting a satoshi test. Becouse they are not sure that trey are dealing with real Buyer instead of broker or scammer — even worst. And on this stage you cant really devide this people. Most of Sellers are requesting POF from the buyer to understand does this particular Buyer has funds on his account.

Fake POFs are flying around whole internet…Its easy to verify POF through bank officer. And all this chain of brokers are burning in a hell…

So what is the solution in this deal? How to prove that Seller is real and he can control particular wallet? How to prove that Buyer is real and hr can prove his funds?