What are Rare Pepes?

Rare Pepes are a type of digital collectible built on the Bitcoin blockchain between 2016 and 2018. The crypto project uses the Counterparty protocol, which allows users to create and trade unique digital assets on top of the Bitcoin blockchain. Rare Pepes are based on the 'Pepe the frog' internet meme, and are known as some of the first NFTs to exist. There were 1,774 official Rare Pepe cards minted across 36 different series.