Former Twitter CEO Jack Dorsey has demonstrated the Lightning Development Kit (LDK), a solution to help developers support fast Bitcoin payments via mobile and point-of-sale terminals.

Dorsey stepped down from Twitter to focus his efforts on Block (formerly Square) which, as a group, is aiming to boost the adoption of Bitcoin as a payment method.

The company’s Square Crypto project was rebranded to Spiral. The company is developing the LDK to enable developers to...