Engraving a message into the bitcoin blockchain is possible. I used the free(!) service EternityWall.it It's extraordinarily simple.
Here is the transaction as seen from multiple Block Explorers:
Included In Block:
- Size: 188 Bytes
EW EriclovesJessica (EW Stands for Eterinity Wall)
Included in Block:
- Size: 310 Bytes
EW Eric Freeburg - Website | EricFreeburg.com | https://ericfreeburg.com
Do It Yourself
Go to Eternity Wall
If no one has used it that day, your message will be in the next block. Good luck!