but would never would dare to post this as a serious answer since it can easily be bypassed ...
You can do it easily using modules "Condition on linked issues" or "Validator on linked issues" from plugin JIRA Workflow Toolbox. I show you an example:
Let's suppose you want to block a certain transition when current issue is linked to another issue by an "is blocked by" issue link and linked issue is any status different from "Resolved" and "Closed". If you were going to use "Validator on linked issues" from JIRA Workflow Toolbox plugin you would use the following configuration (I use three screenshots to show the configuration screen and 1 to show the validator once configured):
CONFIGURATION SCREENS (3 screenshots):
TRANSITION ONCE CONFIGURED:
Fidel Castro Armario
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