this is the output of FYLD.com blockchain

https://www.fyld.com/

If you CC them on an email, it somehow gets timestamped and added to their blockchain to prove you sent that email with that content at that time.

You ARE giving them a complete copy of the email, so yeah that’s scary and sketchy as fuck, so probably don’t do that.

The numbers seem to correlate to the hex color of the backgrounds of the middle numbers. Perhaps a pallet generator of some kind?

Other niche HTTP codes:

420: Enhance Your Calm (used by twitter to rate limit clients, reference to cannabis culture)

451: Unavailable due to legal reasons (now an official code! reference to Ray Bradbury’s Fahrenheit 451 in which books are illegal)