Holy Zohar text. Daily Zohar -213.

Tikkun 18 Continue

When we bow down at the word ברוך, “Blessed”, during the silent prayer, we should meditate on the 10 Sefirot that are the ten letters of the expanded name YHVH as יוד-הא-ואו-הא, = 45= Zeir Anpin.
The letter כ is for Keter, ר is for Chokmah “ראשית חכמה”, the letter ב is for Binah and Malchut, the 2 letters ה and ו are for the 6 Sefirot of Zeir Anpin.

Genesis 14:17-20 Abram (before becoming Abraham) was blessed twice by Malkitzedek, the King of Salem with the word ברוך for connecting to the 10 Sefirot and winning the war over the kings of the “material world”.
The King of Salem is the secret of Moses at the level of Daat. He connected Abraham to Binah and Chessed and prepared him to the covenant with God where Abram received the added letter H ה to his name and changed his entire destiny.