Related for Berakhot 92:1
ויש מהן שחותם בהן בברוך ואין פותח בברוך והטוב והמטיב פותח בברוך ואין חותם בברוך מכלל דברכה בפני עצמה היא
and in others one concludes with "Blessed" but does not commence with it. Since one opens the benediction "Who art kind and dealest kindly" with "Blessed" but does not conclude with it, the inference is that it is a benediction by itself.
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