The text of this Gregorian antiphon is the Marian Advent hymn par excellence, dating formally from the 11th century, and is inspired by texts from the 2nd century by St. Irenaeus, St. Fulgentius and St. Epiphanius. This is the first time in history, as far as we have records, that a performance of this piece is turned into an NFT. In addition, this NFT contains the only copy of the performance of the work. The file will be destroyed after mining, to make this NFT an absolutely unique piece.