How could we do public zap receipts without involving a trusted third-party (like the Lightning server) or tracking the transaction? Could the recipient issue the receipt, in response to a message from the payer? It seems like the receipt is primarily to the advantage of the recipient. If they had to expend some cost, effort, or PoW to publish the receipt, they'd be disinclined to fake it. They'd also be disinclined to bother publishing receipts for 1 sat zaps, which would put upward pressure on the zap amounts. Then you wouldn't need to include the amount, as the amount would tend be above a certain threshhold, so that the receipt merely existing is some proof of the minimum value of the zap. Just pondering this. It seems mostly like an economic and cryptographic conundrum, which means it can perhaps be solved for. But maybe that's a stupid idea. 😂🤷🏻‍♀️