Grant Application - {Zcash NU7 Compatibility for Wallet Core}

Project Summary I request $24,000 to harden, independently review and release the existing transparent v5 Wallet Core repair demonstrated through a pinned Vultisig Android integration. The MVP already produces a confirmed payment using mature Regtest inputs; this grant funds the remaining production work and six months of maintenance. Project Description This project will turn a working compatibility candidate into a reviewed, independently consumable release for the native transparent ZEC send workflow. It preserves the legacy transaction planning, preimage and external-signature interfaces used by the demonstrated Android caller. The pre-grant work is documented at the public repository . It includes the Rust v5 serializer and ZIP 244 transaction ID/signing digests, the Zcash-specific legacy adapter, Android integration patches, an official-reference verifier, a built x86_64 Debug AAR and matching protobuf JAR, and recorded execution evidence. The published baseline reports 39 passing offline checks, 10 passing selected native cases and 4,104 passing Android data-module JVM cases, with 41 documented native-host skips. The actual Android helper also executed on an API 35 emulator.