Interaction with a brand existing app

[giorgionocera]

If the brand already has a mobile application and does not want to change it, the brand could improve its app by accompanying it together with our picowallet app (branded for the brand). In this case, the latter will only perform the wallet operations (store the keys and sign the transactions).
To interact with the blockchains, the existing branded app should interact with nabla services, which are directly accessible through the nabla SDK.

sequenceDiagram
    participant brand_app as Brand<br/>Existing App
    participant picowallet as Brand Picowallet<br/>by nabla
    participant server as nabla Services
    
    opt Never connected to picowallet
        brand_app->>picowallet: Ask for user wallet public information
        picowallet->>brand_app: Return public key and public addresses
    end

    brand_app->>server: Ask for assets linked to the address (NFT owned by the user)
    server->>brand_app: List of assets and media information to correctly display data

    opt Write something on the blockchain
        brand_app->>picowallet: Send transaction information
        picowallet->>brand_app: Allow the user signing the tx<br/>and reply back with the response
    end

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