# Blind oracle

Source URL: https://support.dxp.blockstream.com/education/glossary/blind-oracle
Updated: 2026-05-26T17:13:34.000Z
Letter: B

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A blind oracle is a cryptographic protocol based on zero-knowledge proofs that enable a user to send a confidential message to an entity known as an oracle. The oracle processes the message through operations like signing or encryption without gaining knowledge of the message's contents. The user can then verify the outcome without exposing the message to the oracle.  
  
The Blockstream Jade hardware wallet utilizes this protocol in its[ oracle-enforced PIN protection](https://help.blockstream.com/hc/en-us/articles/9639949755673) feature. This feature encrypts Jade's recovery phrase (mnenomic) to protect against physical threats. It is akin to a _virtual_ secure element that offers additional safeguarding for your funds. It significantly increases the difficulty for potential attackers since they would need to compromise both your locally encrypted flash and the remote PIN oracle. Moreover, this unique security model allows Jade to maintain its open-source nature, as it does not necessitate a built-in secure element.

![](https://storage.googleapis.com/dxp-staging-assets/content/glossary/FO82350175AC4_1.png)

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## Related Terms in This Letter
- [Blind oracle](https://support.dxp.blockstream.com/education/glossary/blind-oracle) (current)
- [Borromean ring signatures](https://support.dxp.blockstream.com/education/glossary/borromean-ring-signatures)
- [Bitcoin Script](https://support.dxp.blockstream.com/education/glossary/bitcoin-script)
- [BitVM](https://support.dxp.blockstream.com/education/glossary/bitvm)
- [BOLT12](https://support.dxp.blockstream.com/education/glossary/bolt12)
- [Bitcoin](https://support.dxp.blockstream.com/education/glossary/bitcoin)
- [Bitcoin Node](https://support.dxp.blockstream.com/education/glossary/bitcoin-node)
- [Bitcoin Core](https://support.dxp.blockstream.com/education/glossary/bitcoin-core)
- [Bulletproofs](https://support.dxp.blockstream.com/education/glossary/bulletproofs)
- [Blind signatures](https://support.dxp.blockstream.com/education/glossary/blind-signatures)
- [Blockchain](https://support.dxp.blockstream.com/education/glossary/blockchain)
- [Block](https://support.dxp.blockstream.com/education/glossary/block)
- [Block Header](https://support.dxp.blockstream.com/education/glossary/block-header)
- [Block Height](https://support.dxp.blockstream.com/education/glossary/block-height)
- [Blockchain Explorer API](https://support.dxp.blockstream.com/education/glossary/blockchain-explorer-api)
- [Broadcast Transaction](https://support.dxp.blockstream.com/education/glossary/broadcast-transaction)