John, Eric, and Chris each came to collecting through different ways–from childhood collecting, to seeing cryptocurrency memorabilia collecting as a merging of hobbies, to getting involved in the arena as a memorabilia producer at Bitcoin Penny. All of the most popular cryptocurrencies, including Bitcoin, LiteCoin, Ripple, Ethereum, Monero, and more have collectible coins that interested individuals can purchase.
Coins fall into three categories–funded coins, which users can destroy and redeem for actual cryptocurrency; DIY coins, which can have a value assigned to them by the user; and non-funded coins, which are strictly for collecting purposes only. Memorabilia is not limited to coins, but can also include wallets and artwork.
There is a variety of quality in these memorabilia, and published encyclopedias detail all the different items out there. Because many of the creators of these memorabilia are well-known, there is not much fraud in the industry.
For more information, or to request that they bring specific pieces to the Bitcoin, Ethereum, and Blockchain Super Conference in February, you can contact them through the Bitcoin Talks Forums, in their collecting sub-forums. John goes by the user name minerjones, Eric by hybridsole, and Chris at bitcoinpenny.