After your coins arrive in our props, your coins are split into random parts and sent to the biggest stock exchanges. You receive back purified BTC (depending on the mix mode you chose). You receive either coins from our clients who took advantage of the “max anonymity” mode, or you receive bitcoins sent from exchanges.
It turns out that even bitcoins coming from an exchange can be flagged as dirty. Yesterday, my wife sent bitcoins from her account on kraken.com to my account on bitpapa.com. My Bitpapa account was blocked, and Bitpapa wrote:
Unfortunately, our analytics system deems your transaction suspicious (high-risk level). This means that your transfer, platform, or wallet from which the transaction was made is funded from questionable sources. In such cases, we follow a strict protocol:
1. You need to undergo identity verification.
2. The transaction will be returned to the sender's wallet address.
If bitcoins from exchanges are no longer considered inherently clean, the purpose of exchanging non-exchange coins for exchange ones becomes obsolete.