📄️ Identity Authority (IA)
An Identity Authority (IA) is a service that verifies a user's ownership of a legacy account (like Discord, X, or Email) and issues cryptographic proof of that ownership on the Nostr network.
📄️ Legacy Identity Providers (LIDP)
A Legacy Identity Provider (LIDP) is any traditional identity or telecommunications service that a Zap Settlement Provider (ZSP) queries to verify user identity during the Claim Flow.
📄️ Zap Settlement Provider (ZSP)
The Zap Settlement Provider (ZSP) acts as the Payment Processor within the Zap Protocol.
📄️ The Fallback Address
How Zapf ensures payments never fail by safely holding funds for users without wallets.
📄️ Verification Model
When a client application (like a wallet or a social client) parses a Proxy Request (Kind 5523) or its resultant Zap Receipt (Kind 5521), it needs to resolve the legacy identifier into a native Nostr identity to display a "Verified" rich profile.