This is a proof-of-concept experimental feature. We use LightningNetwork and Nostr to unlock the paywalled content.

First, log in to Nostr, then pay your LightningNetwork invoice. Nostr is used to synchronize the payment proof, which is a preimage of the invoice, via a direct message by NIP-04 after payment. Your Nostr secret key is only stored locally and doesn't share with server. With NIP-07, you don't even need Nostr secret key.