The messaging app looks nice. I want to see soon the video messaging app with blockchain. Will OP_RETURN support video broadcasting? Are we not up to the mark for that? How much will it cost to send additional messages? How can I show others that I added message to the eternitywall and it is living in the blockchain and it will live forever. Do I need to send money to the address to include the message in the transaction? It seems I know something right, but something not.