The Standard Format of a Blessing

בראשית פרק כד, כז וַיֹאמֶׁר בָרוּךְ ה' אֱל קי אֲדֹנִּי אַבְ רָ הָם

רוקח סמ' שס"ג מכאן למ דנו מטבע ברכות

The structure of a blessing includes the name of HaShem and a reference to His Kingship (שם ומלכות). Rokeach says the blessing of this verse does not contain a reference to Kingship, since HaShem had not yet revealed this aspect to the world. However, Tosafos (Berachos 40b) states that the phrase אלקי אברהם is the reference to His Kingship in the blessing of this verse.