Sealed boxes are designed to anonymously send messages to a recipient given its public key.
Only the recipient can decrypt these messages, using its private key. While the recipient can verify the integrity of the message, it cannot verify the identity of the sender.
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Sealed boxes leverage the crypto_box construction (X25519, XSalsa20-Poly1305).
The premise of boxes is that Alice and Bob know each other and write to each other. Alice can use a box to send a message to Bob. On receipt of the box, Bob knows (a) it came from Alice, and (b) nobody else could have read or tampered with it.
The premise of sealed boxes is that Bob has an anonymous dropbox. Alice can use a sealed box to send a message to Bob. On receipt of the box, Bob knows nobody but the sender could have read or tampered with it. But he knows nothing about who the sender was—it could have been Alice, or Charlie, or Dominique.