Because cryptocurrency and the blockchain are the most talked about, reported, discussed, and hyped financial terms of the year, TD Ameritrade's offering of Bitcoin futures was in danger of getting lost in the mania. So, rather than talking about blockchain, we decided to let the blockchain do our talking. The idea was simple: we needed to embed the first ever ad in the technology... except for one small caveat: the blockchain is decentralized, highly immutable, unchangeable, and unhackable. So how could we find a way to place a message into the most secure ledger in the world?

At its most basic level, the blockchain is a ledger that logs transactions. So how did we turn those transactions into an ad? With a function of the blockchain called OP_Return, which works like the memo space on a check, simple messages and characters can be placed within transactions in the blockchain. Using ASCII art, we painstakingly linked 68 individual Bitcoin transactions, featuring 80 characters per transaction, to design a larger image—the image of the flag being planted—a symbol which spoke to the originality of the execution as well as our rich history of innovation. And all on a shoestring budget of $23.15 USD (just 0.002856 BTC). Within the context of the blockchain, part of the idea was itself was a challenge to discover the ad - which is part of the charm for those who explore the blockchain. However, for the majority, the experience was accessed via a dedicated site which housed all of the individual transactions in one macro view.