Consecrate- Consecration is the solemn dedication to a special purpose or service, usually religious. The word "consecration" literally means "to associate with the sacred". Persons, places, or things can be consecrated, and the term is used in various ways by different groups. Such consecrated persons, places, things, even topics for discussion or subject matter (such as special teachings or doctrines), can also be "circumscribed", i.e. a "circle is drawn" around them a boundary is set which must not be crossed, limiting or regulating rules and laws and warnings are in place, unauthorized approach is forbidden or barred or is deflected or redirected, and careless or casual treatment or use of the person, place, thing, doctrine or subject is a punishable offense (sacrilege) which (normally) discourages any unconsidered disrespect.
Blessing- A blessing, (also used to refer to bestowing of such) is the infusion of something with holiness, divine will, or one's hope or approval.
Through the definitions you can see the difference, I hope, if not Post back to this and I'll see if I can make it even clearer.