[Cryptography] Drop Zone: P2P E-commerce paper

17Q4MX2hmktmpuUKHFuoRmS5MfB5XPbhod at mail2tor.com 17Q4MX2hmktmpuUKHFuoRmS5MfB5XPbhod at mail2tor.com
Thu Mar 26 01:35:13 EDT 2015

I've been working on a new e-commerce protocol that's fully peer-to-peer,
designed for anonymous exchange of goods offline, with no trusted third
party, built on top of The Blockchain.

The paper is available at:

The main properties:
* Encrypted communication using the Bitcoin mainnet and testnet.
* Participants can be anonymous.
* Built-in Reputation controls.
* Contraband markets can be open and anonymous.
* Decentralized e-commerce protocol.

Drop Zone: An Anonymous Peer-To-Peer Local Contraband Marketplace

Abstract. Drop Zone is a solution to the problem of restricted sales in
censored markets. The proposal is for the design of a protocol and
reference client that encodes the location and a brief description of a
good onto The Blockchain. Those wishing to purchase the good can search
for items within a user-requested radius. Sellers list a good as available
within a geographic region, subject to some degree of precision, for the
purpose of obfuscating their precise location. Goods are announced next to
an expiration, a hashtag, and if space permits, a description. Once a
buyer finds a good in a defined relative proximity, a secure communication
channel is opened between the parties on the Bitcoin test network
(“testnet”). Once negotiations are complete, the buyer sends payment to
the seller via the address listed on the Bitcoin mainnet. This spend
action establishes reputation for the buyer, and potentially for the
seller. Once paid, the seller is to furnish the exact GPS coordinates of
the good to the buyer (alongside a small note such as “Check in the
crevice of the tree”). When the buyer successfully picks up the item at
the specified location, the buyer then issues a receipt with a note by
spending flake to the address of the original post. In this way, sellers
receive a reputation score. The solution is akin to that of Craigslist.org
or Uber, but is distributed and as such provides nearly risk-free terms to
contraband sellers, and drastically reduced risk to contraband buyers.

Full paper at:

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