zcash_protocol is used at run time in 18 crates. It is a direct run-time dependency in 5 crates.

Depender (with downloads and own rev deps) zcash_protocol version
10K 13 zcash_primitives ^0.1
8.7K 7 zcash_address ^0.1
3.1K 4 zcash_client_backend ^0.1
600 2 zcash_keys ^0.1
480 zcash_client_sqlite ^0.1