Blackbird Labs has successfully raised $50 million for its innovative blockchain-based payment and loyalty app aimed at enhancing customer engagement for restaurants. With 1,000 establishments already signed up, CEO Ben Leventhal plans to launch the Blackbird Club, a cross-restaurant points system, and expand beyond New York, San Francisco, and Charleston. Led by Spark Capital, the funding round also included Coinbase Ventures and Amex Ventures. Blackbird's Flynet service simplifies transactions while saving restaurants 3-4% on processing fees, addressing the industry's profitability challenges amidst rising costs.