Shouldn't the nonce be different for each password rather than for each install (I take it that by "install" you mean a server or an application installation)?

Shouldn't the nonce be different for each password rather than for each install (I take it that by "install" you mean a server or an application installation)? Nonce-per-password is used in BCrypt and while I don't know much about security, that's the vibe I'm getting from the folks who do.