In a sauce pan over medium heat, add water, sugar, salt and blackberries. Stir occasionally, while allowing to come to a boil. Gently smash blackberries while letting bubble for 5 minutes. Then reduce heat to medium low and let simmer for 15 minutes more. Remove from heat and let cool slightly.
Line bread slices on a baking sheet. Lightly spray with cooking oil. Place in oven and back for 5 minutes. (Should be a very light toast). Let cool for about 5 minutes.
Smear each bread slice with cream cheese then add a spoonful of blackberry compote. Add two or three small pieces of prosciutto to the top and then two or three pieces of chives.
These can be served right away or cover and placed in refrigerator, up to overnight.