The first bitcoin short sale was made for 100 BTC

On October 28, 2010, a landmark event occurred in the nascent world of Bitcoin: the first documented short sale. This transaction was between two early Bitcoin enthusiasts, known by their pseudonyms nanotube and kiba. The deal was facilitated by the #bitcoin-otc market, a decentralized over-the-counter marketplace for Bitcoin trading.
 

The short sale involved a loan of 100 BTC from nanotube to kiba. The mechanics of a short sale in the traditional financial market involve borrowing an asset and selling it with the expectation that the price will fall. The seller then plans to buy back the asset at a lower price, return the borrowed amount, and pocket the difference as profit. In the case of Bitcoin, this concept was still very new, and the transaction between nanotube and kiba marked the first recorded instance of such a strategy being employed.
 

The #bitcoin-otc market operated on a web of trust system, where participants rated each other based on the outcome of their transactions, which allowed for a certain level of confidence in dealings between parties.