Blackbird Labs, a blockchain-based restaurant payment app, has successfully raised $50 million in a Series B funding round led by Spark Capital, with notable participation from Coinbase Ventures, a16z crypto, Union Square Ventures, and Amex Ventures. This investment brings the total capital raised to $85 million. The app incentivizes users with its proprietary crypto token, $FLY, which can be utilized across a network of over 600 restaurants in major cities such as New York City, San Francisco, and Charleston. The funding aims to enhance the app's offerings and expand its loyalty program, promising exclusive benefits to frequent users.