Attention this post is only for personal culture!
In Black Market accepted payment methods are: Bitcoin, Monero, Litecoin, Ethereum, ZCash. A lot of merchandise classified as illegal is purchased from the world of TOR (Onion Links, Darknet).
First of all we need to distinguish between three types of shipments:
1) Shipping by ordinary mail (priority mail)
2) Shipping by express courier
3) Exchange by hand
In all three cases there are some rules to follow for both sellers and buyers to ensure a fair level of security.
-With regard to ordinary or priority mail, shipments of this type are the simplest and least risky both to send and to receive, however, not being traceable nor guaranteed, they are advisable only for the shipment of small goods. The ordinary mail is that which is normally imbedded in letterboxes: it is therefore possible to send it anonymously and at the same time receive it anonymously. Later on you will see how.
-Shipments by express courier are riskier: in fact, having to sign both the shipment and the receipt, you become directly responsible for the contents of the envelopes and packages. So those who buy on the Deep Web resort to the use of a nominee, false documents or an internal connection.
-Hand exchange (GPS Drop). In the case of particularly important and risky goods, a manual exchange may be necessary, which if performed correctly can offer an excellent degree of security and anonymity. The GPS Drop consists of depositing the package to be delivered in a hidden area of a public place, and then making its position known to the recipient.
For example, the bathroom box of a shopping center: the sender deposits the package anonymously (it is not possible to know who of the many users of the bathroom, actually deposit the package) and in the same way the recipient safely withdraws it (unless you search anyone leaving or checking the bathroom after each use), in fact it is not possible to know who of the many subsequent users actually retrieve the goods.
This example, however, greatly simplifies all the possible situations that can actually happen: the fact that a stranger can find the package, stakes and cameras, as well as checks on the positions of mobile phones or fingerprints.