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  4. Chainpoint API
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Chainpoint API

The Chainpoint API offers developers free access to blockchain proofing capabilities, ideal for document timestamping and audit trails without relying on centralized authorities.

Developed by Chainpoint Foundation

Live API
99.90%Uptime
200msLatency
450Stars
No AuthAuth
NoCredit Card
RESTStyle
v1Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Creates cryptographic proof for data

Endpoint URL
https://anchor.chainpoint.org/hashes
Code Example
curl -X POST 'https://anchor.chainpoint.org/hashes'
Request Payload
{
  "hash": "2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae"
}
Expected Response
{
  "proof_id": "1a0b9d8f-1234-5678-90ab-cdef01234567"
}
Version:v1

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://anchor.chainpoint.org/proof"

Docs

Technical Documentation

What this API does

The Chainpoint API enables developers to anchor data hashes onto the Bitcoin blockchain, providing tamper-evident and verifiable proofs of data integrity. This service relies on cryptographic hashing and Merkle trees to secure digital proofing processes.

How it works

Developers can submit data hashes through RESTful endpoints and receive immutable timestamps that verify the existence of that data. The API simplifies interactions with blockchain technology, allowing for both single and batch submissions.

Authentication

The Chainpoint API does not require authentication or API keys for basic usage, making it accessible for developers to quickly integrate into their applications.

Example usage

  • /proofs - Submit a new proof to the blockchain.
  • /proofs/{proof_id} - Retrieve the status of a specific proof.
  • /proofs/batch - Submit multiple proofs in a single request.

Limits

There are no documented rate limits available for the Chainpoint API, making it flexible for developers to use as needed.

Ideal use cases

  • Document timestamping for compliance and validation.
  • Creating audit trails for sensitive transactions.
  • Integrating blockchain proofs into existing applications for enhanced security.
  • Using the API in any project that requires tamper-proof data verification.

Examples

Real-World Applications

  • Creating auditable records for legal documents
  • Securing digital assets in financial applications
  • Developing applications requiring proof of data integrity
  • Integrating blockchain verification in data management tools
  • Establishing tamper-proof audit trails for compliance

Evaluation

Advantages & Limitations

Advantages
  • ✓ Free to use with no signup required
  • ✓ Open-source Apache 2.0 licensed
  • ✓ Official JavaScript SDK for easy integration
  • ✓ No authentication or API keys needed
  • ✓ Immutable proofs anchored on Bitcoin blockchain
Limitations
  • ✗ No formal rate limits available which might lead to throttling under heavy use
  • ✗ Limited to anchoring data on Bitcoin blockchain only
  • ✗ Lacks advanced authentication features for enterprise needs
  • ✗ Documentation largely oriented to developers familiar with blockchain concepts

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

v1
Pricing Model
Free and open-source
Credit Card
Not Required
Response Formats
JSON
Supported Languages
5 Languages
SDK Support
JavaScript
Rate Limit

No published limits

Time to Hello World

Minutes

Free Tier

Unlimited usage with no cost and no signup required

Best For

Developers needing immutable timestamping or blockchain proofs without complex setup

Not Ideal For

Applications requiring private blockchain anchoring or advanced enterprise authentication

Tags

#merkle#data-integrity#timestamp#proof#chainpoint#blockchain#bitcoin#open-source

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