I am a little baffled, I cannot get my brain into gear to pin point what these data format the following is:
5540 6EA5 0709 24DF A45C 5BF3 AE5A 4350 BC40 6988
Any ideas ?
I think the consensus it that the above is a PGP key
As you have found it on a business card, then it is PGP key for sure. Was there any QR code in the business card. Basically PGP keys on business cards are used to download vCard using QR Code.