Agree on a sketch of the overall wallet architecture about librustzcash HOT 4 OPEN

str4d commented on July 17, 2024

Agree on a sketch of the overall wallet architecture

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Comments (4)

str4d commented on July 17, 2024

Rough (and incomplete, hence not put into the top post) sketches from a meeting with Daira-Emma and Kris:

Current light client wallet architecture:

flowchart
    zcashdConsensus

    zcashdConsensus -- Chain tip change --> lightwalletd
    zcashdConsensus -- New blocks --> lightwalletd

    subgraph Indexer
    zcashdDb
    lightwalletd
    end

    zcashdConsensus <-- Stuff --> zcashdDb
    zcashdDb<-- UpdateChainTip --> lightwalletd
    zcashdDb<-- GetUTXOs --> lightwalletd
    zcashdDb<-- GetTransaction --> lightwalletd

    subgraph Mobile wallet app
    Scanner
    Wallet
    end

    Wallet -- Register UFVK --> Scanner
    Wallet -- (LC) [nf], ScanRange --> Scanner
    lightwalletd <-- UpdateChainTip --> Wallet
    lightwalletd <-- GetUTXOs --> Wallet
    lightwalletd <-- GetTransaction --> Wallet
    Scanner <-- CompactBlockRange --> lightwalletd
    Scanner -- ScannedBlock --> Wallet

Sketch of possible desired architecture:

flowchart
    FullValidator
    Indexer
    Scanner
    Wallet

    FullValidator -- Chain tip change --> Indexer
    FullValidator -- New blocks --> Indexer

    Wallet -- Register UFVK --> Scanner
    Wallet -- (LC) [nf], ScanRange --> Scanner
    Scanner <-- (Compact)BlockRange --> Indexer
    Scanner -- ScannedBlock --> Wallet

Wallet
- Trusted with privacy and spend authority.
Scanner
- Trusted with privacy in perpetuity. Has access to user-specific data.
Indexer
- Can observe usage patterns for the duration it is used.
- Trusted with correctness of the chain data, but that trust can be removed with bandwidth increase (Fly Client proofs).
Full Validator
- Trusted with correctness of the chain data.

LC: Light Client

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str4d commented on July 17, 2024

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jackgavigan commented on July 17, 2024

Should the Scanner obtain the blocks from the Indexer, or direct from Zebra's database? (Assuming the scanner is running on the same machine as Zebra.)

I assume that t-address balances and transactions will be obtained by querying the Indexer?

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