Smart contract-based car parts supply chain orchestrates bidirectional interactions between manufacturers, distributors, retailers, and customers through a central contract hub. The architecture enables transparent, immutable recording of parts movement from production through retail to end-user, with each actor calling and receiving confirmations from the smart contract. This pattern eliminates intermediaries, reduces fraud, and provides real-time visibility across the entire automotive supply chain. Fork this diagram on Diagrams.so to customize contract logic, add payment channels, or integrate with specific blockchain networks like Ethereum or Hyperledger Fabric. The sequence design supports multi-party consensus and automated compliance verification at each supply chain stage.