This is a good write-up on how zk-proofs can be used to increase the scalability of blockchains: https://polynya.medium.com/rollups-data-availability-layers-mo

This is a good write-up on how zk-proofs can be used to increase the scalability of blockchains: https://polynya.medium.com/rollups-data-availability-layers-modular-blockchains-introductory-meta-post-5a1e7a60119d https://polynya.medium.com/rollups-data-availability-layers-... zcash initially used zk-proofs only for privacy. It is only now looking to utilize it for scalability.