CBDC’s will be the primary control mechanism that enforces the mark of the beast but the technology itself won’t be the mark. God doesn’t care that you bank digitally. He is concerned with your allegiance and moral character. The mark will primarily be a matter of forced worship to a false pseudo-Christianity, enforced by the tech being implemented right now. If you go along with the system to avoid persecution, you take the mark. If you stay faithful to God, you get His seal and make yourself a target of the beast.