The MVP version is that everyone buys (obviously transferrable) credits, and communications have a credit amount attached. Each person can set a minimum below which communications get filtered out entirely, and the target can see the credit bid when determining whether to open the message. Once they open the message, they can choose to keep the credits, do nothing or tip the person back depending on whether they found the interaction helpful.
By the way, such technology already exists and is called “blockchain”; it allows to send public or semi-public (encrypted) messages to anyone but requires to pay for that, and it allows to authenticate sender (in particular, for forwarding messages).
By the way, such technology already exists and is called “blockchain”; it allows to send public or semi-public (encrypted) messages to anyone but requires to pay for that, and it allows to authenticate sender (in particular, for forwarding messages).