A wallet specific feature? So far as I can see, Blockstream does not have a field to enter a message. Am curious how exactly are you sending it that allows you to add a message?

The sender should be able to add a message.

bitcoin_beginners

Possible to Generate a QR with a Specific Number of Sats to Coinos Address?

spiderman

I scanned my own Coinos QR code with the Blockstream green android wallet. The user journey was like 

* Open the send screen
* Scan the QR code, the address `<user>@coinos.io` populates in the address box
* enter the amount (something I wish I could avoid)
* slide to send

Sure enough, the Sats landed within a minute. But it does not look like there is a way for the sender to add any metadata that is visible to the user. The only common field visible on both sides is what they call the _payment preimage_, which is a long incomprehensible string like 9f44..249c, which I can use to identify the sender. 
