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Proof of Existence API

Proof of Existence allows users store an online distributed proof of existence for any document anonymously and securely on the Bitcoin blockchain. Documents themselves are not stored. Instead, Proof of Existence stores a cryptographic digest of each file along with the time of upload for verification purposes. This allows users to prove that they have certain information without having to reveal their data or themselves.

Proof of Existence provides decentralized proof that no third party or government can tamper with. Validation is provided through the Bitcoin blockchain, allowing users to access the cryptographic digest for a file even if the Proof of Existence site is damaged or down.

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Proof of Existence: Highlights

Document proof of existence service
Data Formats
API home

Proof of Existence: Specifications


Client Install Required
Service Endpoint

Signup and Licensing

Signup Requirements
Developer Key Required
Account Required
Commercial Licensing
Managed By
Proof of Existence  
Non-Commercial Lic.
Data Licensing
Usage Fees
Program Fees
Certification Program
Usage Limits
Terms of Service


Authentication Model
SSL Support
Read-only Without Login


Vendor API Kits
Community API Kits
API Blog
Site Blog
API Forum
Developer Support
Console URL

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