Digital currency, once mocked as a tool for criminals and reckless speculators, is sliding into the mainstream.

Traditional banks are helping investors put their money into cryptocurrency funds. Companies like Tesla and Square are hoarding Bitcoin. And celebrities are leading the way in a digital-art spending spree using a technology called an NFT.

On Wednesday, digital or cryptocurrencies took their biggest step yet toward wider acceptance when Coinbase, a startup that allows people to buy and sell cryptocurrencies, went public. Coinbase shares began trading at $381 each, up 52% from a reference price of $250, eventually closing at $328.28. That gave the company a valuation of $85.7 billion based on all its outstanding shares, more than 10 times higher than Coinbase’s last private valuation.