Circle has announced that it plans to become a public company. The cryptocurrency company will merge with Concord Acquisition Corp, a SPAC. Circle is better known as one of the founding members of the Centre consortium with Coinbase. Along with other crypto partners, they have issued USD Coin (USDC), a popular stablecoin. A SPAC is a publicly traded blank-check company. Merging with a SPAC has become a popular way to become a publicly listed company for tech companies. According to Circle, the deal should value the company at $4.5 billion….