Cavefish: Communication-Optimal Light Client Protocol for UTxO Ledgers

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Blockchain light clients (LCs) are agents with limited computational or storage resources that cannot maintain a fully validated copy of the ledger. They rely on service providers (SPs), typically full nodes, to access data required for tasks such as constructing a transaction (Tx) or interacting with off-chain applications. We introduce Cavefish, a novel protocol for UTxO-based platforms that enables LCs to interact with the ledger and submit a transaction (Tx) with minimal trust, storage, and