SQ

Financial technology (fintech) company Square (NYSE:SQ) has two main components to its business -- its payment-processing ecosystem for small businesses and its Cash App person-to-person payment platform. It also has operations in business lending, a stock trading platform, and several other adjacent businesses, and recently introduced Square Online Store, which helps merchants build out e-commerce and omnichannel capabilities.

Square is a blockchain stock in two main ways. Most obviously, Cash App allows users to buy and sell bitcoin quickly and easily, and with more than $1.6 billion in bitcoin purchased in the third quarter of 2020 alone, this is a significant part of the company's business.

Square has its own team of bitcoin developers, known as Square Crypto, that has several exciting projects of its own.