I bought an amount of BTC from a stranger and made my payment in cash! I checked to see if the BTC was available and if they were, after a day they just disappeared. Does somebody know anything about this? What happened? What is this situation called or something like that?
We are in 2023 going to 2024, though your complaint lack adequate information to properly digest the situation and give proper solution or advice to avoid such occurrence next time, the only thing of sense I could grab here is you stating you bought Bitcoin from a stranger, we are no longer in 2010 to 2014 when buying Bitcoin was a hurdle for many due to lack of trusted exchange platforms, why would you opt to buying Bitcoin from a stranger when you should have bought directly from the exchange, several exchanges offer fiat deposit through p2p or direct deposit ..
Whether it be centralized or non-custodial wallet you used to received those bitcoins, what I believe you saw was the incoming transaction, and seeing that you are a newbie the person you bought from probably reversed the transaction..
Or another possible scenerio is, if you meet the person whom you bought the Bitcoin from physically(since you said you paid him in cash), then recall if you gave this person your phone, the person must have used that opportunity to copy and save your wallet private key on his own device, and immediately after sending you the Bitcoins you bought, he went behind you back to login into your wallet though with your private keys, then withdrew those coins back..
You gotta be very vigilant and careful in this space man .