Enable strong ownership check on imported certificates

[bedinotti]

Our long term plan is to enforce ownership of any imported certificates. Right now, this check is disabled. But we should start checking on import and reject certificates that the current wallets don't own.

[rtraba]

is there any update regarding enforcing ownership? ... if yes, I'd like to check that and test how it works

[ghost]

@rtraba currently there is not.