HELLO blcok

Is used to carry necessary data to establish connection (e.g. connector) between 2 parties. The data should be complete enough to let the invited party user consider wh is inviting and why.

Hello block is a protected block signed by the sender, carrying following payload:

    "payload": {
        "connector_id": <string>,
        "message": <short text message (up to 2034 unicode characters)>,
        "requesting_paty": {
            id: <string>,
            // optional data: avatar_url, phone, email, nick, another key