Pay to Blinded Key (P2BK) uses Elliptic Curve Diffie-Hellman (ECDH) to establish a shared secret key over a public or insecure channel.
Here's how it works... in layman's terms.
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The magic of ECDH is possible because a person's Public key (eg: NPUB) is their Private key multiplied by the curve base point G.
It's a calculation that simple to do, but pretty much impossible to reverse engineer.
In other words, you can easily calculate a public key (P) given its private key (p), but crucially, you can't calculate a private key from the public key!
