According to CoinMeta, Wu said that the Spark payment protocol experienced a service interruption today, which lasted for about 4 hours and has now been restored. Blink Wallet previously stated that its Spark service for unmanaged accounts was temporarily unavailable, and the team is investigating the issue. Lightspark, developed by former PayPal President David Marcus, is a payment protocol compatible with Lightning Network and supports assets such as stablecoins. Wallets including of, Satoshi, and Blink have already integrated with Lightspark.