Colibri Stateless — Python

Verify Ethereum RPC data cryptographically — without running a full node.

ETH2.0 Spec Version 1.4.0 License

Colibri Stateless is a highly efficient prover/verifier for Ethereum (with upcoming support for Layer-2s such as OP-Stack). These Python bindings wrap the C core and give you an async API that verifies every RPC response against the beacon chain — no full node, no continuous sync.

Website · Docs · Whitepaper · Privacy (PAP)

Why Colibri?

Stateless — verification needs nothing but the proof and the sync committee it is checked against. The committee is cached locally so it does not have to travel with every request, but it works just as well with an empty cache or none at all. No persistent state, no full node.
Cryptographically verified RPC — every RPC response is checked against BLS signatures.
Offline verification — proofs are fully self-contained and verify without any network connection, thanks to zk-proofs for the sync committee and signed checkpoints.
On-demand, not always-on — work happens only when you make a request; no background sync burning bandwidth, CPU, or battery.
Verifies historical data (older than ~27h / 8192 blocks) — via historical_summaries proofs, where other light clients simply fail.
eth_getLogs completeness proofs — optional logs_completeness=True proves no matching log was omitted in the requested range.
Fully verified local transaction simulation — simulate a transaction against verified state before signing.
Privacy-aware — Pragmatic Adaptive Privacy (PAP) mode (privacy_mode=PrivacyMode.BASIC). Experimental.

Quick Start

Installation

python3 -m pip install colibri-stateless

Basic Usage

import asyncio
from colibri import Colibri

async def main():
    # Initialize client for Ethereum Mainnet
    client = Colibri(chain_id=1, provers=["https://mainnet.colibri-proof.tech"])
    
    # Make verified RPC call
    result = await client.rpc("eth_blockNumber", [])
    print(f"Current block: {result}")
    
    # Get account balance with proof verification
    balance = await client.rpc("eth_getBalance", [
        "0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5", 
        "latest"
    ])
    print(f"Balance: {balance}")

# Run async function
asyncio.run(main())

Python-specific features

Async/await — modern async API for all network operations.
Pluggable storage — customizable storage backends for caching.
Easy integration — pip install with pre-built native extensions.
Testing utilities — mock HTTP requests and storage for deterministic tests.
Multi-chain — Ethereum Mainnet, Sepolia, Gnosis Chain, and more.
Local eth_call proofs — use_accesslist=True (default) uses eth_createAccessList; set False for legacy debug_traceCall.
Privacy-preserving eth_call — combine ProverMode.HYBRID + PrivacyMode.BASIC + oblivious_nodes (default empty; e.g. https://rpc.safe-node.com/, API key for testing). Setting oblivious_nodes auto-enables PAP. TEE/ORAM background: Oblivious Labs.

Documentation

Full documentation: GitBook Guide

API Reference — complete class and method documentation
Storage System — custom storage implementations
Testing Framework — mock data and integration tests
Configuration — chain setup, use_accesslist / prover mode, and other advanced options
Building from Source — development and contribution guide

Development

Building from Source

# Clone repository
git clone https://github.com/corpus-core/colibri-stateless.git
cd colibri-stateless/bindings/python

# Build native extension
./build.sh

# Option 1: Use virtual environment (recommended)
python3 -m venv venv
source venv/bin/activate
pip install -e .
pip install -r requirements-dev.txt

# Run tests
pytest tests/ -v

# Deactivate when done
deactivate

Alternative without virtual environment:

# Install test dependencies with --user flag
python3 -m pip install --user pytest pytest-asyncio aiohttp

# Run tests directly with PYTHONPATH
PYTHONPATH=src python3 -m pytest tests/ -v

Quick Debug Build

For faster iteration during development:

# Build in debug mode
./build_debug.sh

# Run tests without installation
PYTHONPATH=src python3 -m pytest tests/ -v

Integration Tests

# Run with real blockchain data (offline)
from colibri.testing import discover_tests, run_test_case

tests = discover_tests()
for test_name, test_config in tests.items():
    result = await run_test_case(test_name, test_config)
    print(f"Test {test_name}: {'PASSED' if result else 'FAILED'}")

System Requirements

Python 3.8+
CMake 3.20+ (for building from source)
C++17 compiler (for building from source)

Related Projects

Core Library: colibri-stateless
Swift Bindings: iOS/macOS native integration
Kotlin Bindings: Android/JVM integration
JavaScript Bindings: Web/Node.js integration

License

MIT License - see LICENSE for details.

Contributing

Contributions welcome! Please read our Contributing Guide and check the Development Documentation.

Release files for colibri-stateless 2.0.4

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Built distributions (wheels)

Table of built distributions (wheels) for colibri-stateless 2.0.4
File	Interpreter	ABI	Platform	Reset
colibri_stateless-2.0.4-cp314-cp314-win_amd64.whl 549.7 kB Aug 11, 2026	CPython 3.14	CPython 3.14	Windows x86-64	Details
colibri_stateless-2.0.4-cp314-cp314-manylinux_2_17_x86_64.whl 637.4 kB Aug 11, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.17+ x86-64	Details
colibri_stateless-2.0.4-cp314-cp314-macosx_26_0_universal2.whl 488.0 kB Aug 11, 2026	CPython 3.14	CPython 3.14	macOS 26.0+ universal2 (ARM64, x86-64)	Details
colibri_stateless-2.0.4-cp312-cp312-win_amd64.whl 536.3 kB Aug 11, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
colibri_stateless-2.0.4-cp312-cp312-manylinux_2_17_x86_64.whl 637.3 kB Aug 11, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.17+ x86-64	Details
colibri_stateless-2.0.4-cp312-cp312-macosx_26_0_universal2.whl 487.8 kB Aug 11, 2026	CPython 3.12	CPython 3.12	macOS 26.0+ universal2 (ARM64, x86-64)	Details

Total release size: 3.3 MB

Release files / colibri_stateless-2.0.4-cp314-cp314-win_amd64.whl

Download URL	colibri_stateless-2.0.4-cp314-cp314-win_amd64.whl
Size	549.7 kB
Tags	CPython 3.14 Windows x86-64
SHA-256 checksum How to use checksums	`05ac11e3d93b8838e1dfd152a754ec45fae2345bdf9506faebae75c70408dc24`
BLAKE2b-256 checksum How to use checksums	`1ae966afe8068f846d9f2cc7a3131848fe421703344b3c8b605fda1e4d410841`
Upload date	Aug 11, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/7.0.0 CPython/3.10.20`

Release files / colibri_stateless-2.0.4-cp314-cp314-manylinux_2_17_x86_64.whl

Download URL	colibri_stateless-2.0.4-cp314-cp314-manylinux_2_17_x86_64.whl
Size	637.4 kB
Tags	CPython 3.14 Linux glibc 2.17+ x86-64
SHA-256 checksum How to use checksums	`4af22970efe0d8456a81ffaecbd709ba8a455a720ef6abc217d016a92c923600`
BLAKE2b-256 checksum How to use checksums	`49c0b31832e0505f1f97e1a6a418483e9fb4a4cabbf166b88ca943cd308d585d`
Upload date	Aug 11, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/7.0.0 CPython/3.10.20`

Release files / colibri_stateless-2.0.4-cp314-cp314-macosx_26_0_universal2.whl

Download URL	colibri_stateless-2.0.4-cp314-cp314-macosx_26_0_universal2.whl
Size	488.0 kB
Tags	CPython 3.14 macOS 26.0+ universal2 (ARM64, x86-64)
SHA-256 checksum How to use checksums	`adddd184731744da7dde15c8efa281e11e427205c93c801d7af5c165945cf0d5`
BLAKE2b-256 checksum How to use checksums	`c727094c502327e625083031403cc08fca83642b8da7283c62a1fc9d3fbf6cc4`
Upload date	Aug 11, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/7.0.0 CPython/3.10.20`

Release files / colibri_stateless-2.0.4-cp312-cp312-win_amd64.whl

Download URL	colibri_stateless-2.0.4-cp312-cp312-win_amd64.whl
Size	536.3 kB
Tags	CPython 3.12 Windows x86-64
SHA-256 checksum How to use checksums	`4f7191511cdf1f7c134e8fa55a2f926ee131351d4a08214662214e75ef5df8a2`
BLAKE2b-256 checksum How to use checksums	`e5eee1875647d546d5d62ee3b1ae146a8a8376a52474f159cbbeef09bcb0432d`
Upload date	Aug 11, 2026
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Uploaded via	`twine/7.0.0 CPython/3.10.20`

Release files / colibri_stateless-2.0.4-cp312-cp312-manylinux_2_17_x86_64.whl

Download URL	colibri_stateless-2.0.4-cp312-cp312-manylinux_2_17_x86_64.whl
Size	637.3 kB
Tags	CPython 3.12 Linux glibc 2.17+ x86-64
SHA-256 checksum How to use checksums	`1619fc6816636d820a1ba57d7117f4f4fcf4c5336dd35f9dd5aeb1cb864b2ea8`
BLAKE2b-256 checksum How to use checksums	`fca6d049e26dd95a464de3dd34fc11b6ae0cde65a32f63afcc804cde92d8c01f`
Upload date	Aug 11, 2026
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Uploaded via	`twine/7.0.0 CPython/3.10.20`

Release files / colibri_stateless-2.0.4-cp312-cp312-macosx_26_0_universal2.whl

Download URL	colibri_stateless-2.0.4-cp312-cp312-macosx_26_0_universal2.whl
Size	487.8 kB
Tags	CPython 3.12 macOS 26.0+ universal2 (ARM64, x86-64)
SHA-256 checksum How to use checksums	`17f413971c7f3929e1ccec3fec43faea5629dd5309b8ba558ffdc3b25d52e534`
BLAKE2b-256 checksum How to use checksums	`bf24efe26e6e8d88d91993cc3bbc9f0f6f5f4adda4c0f79ea0dfe4021e54e5b2`
Upload date	Aug 11, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/7.0.0 CPython/3.10.20`