A short introduction to Canis Major
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Canis Major is an adaptor that supports persistence and verification of NGSI-LD entity transactions in blockchains like Ethereum. It handles entity creation, update, retrieval and batch creation by generating a hash of the transaction and storing it on the blockchain as well as relating the transaction receipt to the original entity in a context broker. Alternative implementations include a proxy in front of the broker to handle connections to Canis Major transparently.
A short introduction to Canis Major
- 1. A short introduction to Canis Major Notarizing interaction with NGSI-LD
- 2. 1 “Canis Major is an adaptor that supports persistence and verification of NGSI-LD Entity-Transactions in blockchains” ▪ currently persistence into ETH-compatible blockchains like Alastria ▪ handles entity creation, update, retrieval and batch-creation ▪ API is a subset of the NGSI-LD API ▪ Responds the Transaction-Receipt ▪ all blockchain transactions are additionally stored as an Entity inside a broker ▪ Query-API to retrieve transaction-data by entities
- 3. 2 ▪ uses SmartDatamodel for distributed ledger: □ https://github.com/smart-data-models/dataModel.DistributedLedgerTech ▪ only stores hashes - less costs, no plaintext data ▪ transaction stored in the broker are related to the original-entity • concrete change can be reconstructed • hash can be used to verify the change
- 4. 3 ▪ Client application calls Canis Major & Context Broker ▪ Canis Major generates the hash and persists the transaction to the Blockchain ▪ Canis Major stores transaction receipt in Context Broker ▪ Canis Major relates the transaction receipt to original entity
- 5. 4 ▪ Alternative: proxy in front of the broker, handling the connection to Canis Major transparently
- 6. 5 ▪ Canis Major can sing transactions with a default key ▪ supports the usage of external wallets: • client sends information about singing-endpoint to Canis Major • Canis Major creates Transaction-Object and sends it for signature to clients keystore • Keystore signings and sends back • Canis Major persists signed transaction to dlt
- 7. 6 Demo-Scenario: 1. Customer Alice orders a packet in a store 2. Bicycle-Courier Bob takes the packet for delivery from the store 3. Alice receives the packet from Bob 4. A manager checks the status of the packet
- 8. 7 Links: ▪ https://github.com/FIWARE/CanisMajor ▪ Running deployment on K8s: • https://github.com/FIWARE-Ops/fiware-gitops/tree/master/aws/token ▪ Integration tests: • https://github.com/FIWARE/CanisMajor/tree/master/it ▪ Docker Compose: • https://github.com/FIWARE/CanisMajor/tree/master/it/docker-compose ▪ Smart Datamodel: • https://github.com/smart-data-models/dataModel.DistributedLedgerTech ▪ Demo Postman-Collection: • https://github.com/wistefan/presentations/blob/main/wednesday-webinar/canismajor/CanisMajor-d emo.postman_collection.json