Upgrading blockchains to post-quantum cryptography typically causes severe network congestion, high gas fees, and state bloat because of the large size of post-quantum signatures and zero-knowledge proofs, according to the supplied material. Compact Shielded client-side validation (CSV) is presented as a way to address this.
The approach removes signatures from the blockchain and shifts data storage and verification to end-user devices. Under the design, eliminating signatures leaves a 96-byte on-chain footprint.