[2020] Bolt Search Event Puzzle #6 - The Number Game

Following a hot trail, you come to an excavation site. While the work has only begun, you see some markings on a wall that was partially dug up.

104 116 116 112 115 058 047 047 098 105 116 046 108 121 047 051 106 121 075 117 114 122

Weird.

As always, the first person to solve the puzzle gets an extra hint!

Good luck!

WINNER: /u/PaoloMustafini