# Nostr: What do `npub` and `nsec` mean?

`npub` is a human-readable encoding of a Nostr public key, suitable for sharing.

2026-08-13
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Switchboard Tech Services


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## Short answer

`npub` is a human-readable encoding of a Nostr public key, suitable for sharing. `nsec` encodes the private key and should be treated like a secret, never posted or entered into an untrusted site. NIP-19 defines these display formats; the underlying protocol uses the key data in other encodings. A screenshot containing your `nsec` can be enough to compromise your identity.

## Sources

[NIP-19: Human-readable encodings](https://github.com/nostr-protocol/nips/blob/master/19.md).

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Canonical URL: https://switchboardtechservices.com/guides/nostr-what-do-npub-and-nsec-mean/

Language: en-us

Content type: guide

Author: Switchboard Tech Services

Published: 2026-08-13T22:08:12+00:00

Description: A practical answer to What do `npub` and `nsec` mean?