nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug what's this? Seems like a neat feature 
Discussion
You can request a Blockchain timestamp in any post by pressing the 3-dot settings in each post. It just takes a while to get the confirmation from the chain.
care to share how that works?
It's just nip03 https://github.com/nostr-protocol/nips/blob/master/03.md
I forgot about this NIP. Thanks