B Pass

B PASS is a blockchain-based digital identity service launched in 2020 by Coinplug (now CPLABS) in partnership with the Busan Metropolitan Government as part of South Korea's blockchain regulation-free zone initiative. The platform implements Self-Sovereign Identity principles using W3C DID standards and operates on the Metadium blockchain.

The system serves as a unified digital identification platform that enables Busan's 3.4 million citizens to access various public and private services through a single mobile app. Key features include:

• Mobile ID verification for public facilities and services
• Digital credentials including:
  • Busan Citizen Card
  • Library membership card
  • Mobile Family Love Card
  • Transportation cards
  • Digital vouchers
• Secure access to unmanned convenience stores via QR codes
• Anonymous reporting system for public safety incidents
• Integration with the Busan Public Safety Report app

The platform represents one of South Korea's first large-scale implementations of decentralized identity in government services. The technical architecture stores personal data directly on users' devices rather than in centralized databases, with blockchain used to verify credentials while maintaining user privacy and data sovereignty. Notable institutional support comes from the Korean Internet & Security Agency (KISA), Ministry of Science and Technology, and other government bodies as part of South Korea's broader smart city and digital transformation initiatives.