Enable deactivation of unsecure client versions

**Is your feature request related to a problem? Please describe.**
User do not update client versions regularly. Known security risks can be exploited longer than needed.

**Describe the solution you'd like**
- Client checks if the version is blacklisted
- when blacklisted, client can't be used to perform tasks, which require private key
- user gets an information to update the client version

**Describe alternatives you've considered**
none

**Additional context**
proposal scammer

Start by locating how this JavaScript client determines its version and how tasks requiring a private key are handled. Define the blacklist source and version policy, then verify that blacklisted clients are blocked from those tasks and show an update message.

Written by the indexing model from the issue text.