coincurve
Safest and fastest Python library for secp256k1 elliptic curve operations
Decision gist · record as of 2026-08-14
Yes. coincurve is production-stable, actively maintained, widely adopted in blockchain infrastructure, has no known vulnerabilities, and offers fast Python bindings to secp256k1. Install it if you need secp256k1 operations; the medium install friction is justified by the performance and correctness guarantees of the underlying C library.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later; on platforms without prebuilt wheels, a C compiler and libsecp256k1 development headers are needed.
- Medium install friction due to compiled C bindings; prebuilt wheels are available for Python 3.9–3.13 across macOS, Linux, and Windows architectures, reducing build overhead on common platforms.
License · maintenance · safety
MIT OR Apache-2.0 (permissive) — Dual-licensed under MIT or Apache-2.0, both permissive licenses; you may choose either license when using or redistributing the package.
last release 2025-03-08 (524 days) · last repo commit 2026-08-12 · 181 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 3,254,947 downloads/mo, #2,683 on PyPI
Alternatives
Verify before relying
pip install coincurve
from coincurve import PrivateKey
private_key = PrivateKey()
public_key = private_key.public_key
signature = private_key.sign(b'message')- Whether the package supports key derivation (BIP32/BIP44) or only basic signing and verification operations.
- Performance characteristics compared to pure-Python elliptic curve libraries for typical workloads.
- Full API surface for ECDH, Schnorr signatures, and other operations beyond basic signing.
What it is and what it does
coincurve wraps libsecp256k1, the heavily optimized C library used by Bitcoin Core, to provide Python developers with fast, production-grade elliptic curve operations on the secp256k1 curve. It handles ECDSA signing and verification, ECDH key exchange, and Schnorr signatures—the cryptographic primitives underlying blockchain systems.
The package is used by major projects including Ethereum, LBRY, and libp2p. It supports Python 3.9 through 3.13 and both CPython and PyPy implementations. Installation is straightforward on common platforms thanks to prebuilt wheels; on less common architectures, you may need a C compiler and libsecp256k1 development headers.
Use it for
- Sign and verify transactions in Bitcoin or Ethereum applications without implementing elliptic curve math yourself.
- Perform ECDH key exchange for establishing shared secrets in peer-to-peer or blockchain protocols.
- Generate and manage secp256k1 keypairs for cryptocurrency wallets or signing services.
- Implement Schnorr signatures for protocols that require this signature scheme.
- Integrate cryptographic operations into applications that depend on libsecp256k1 semantics.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
coincurve is production-stable, actively maintained, widely adopted in blockchain infrastructure, has no known vulnerabilities, and offers fast Python bindings to secp256k1. Install it if you need secp256k1 operations; the medium install friction is justified by the performance and correctness guarantees of the underlying C library.
Install
coincurve on PyPI
Before you install
Medium install friction due to compiled C bindings; prebuilt wheels are available for Python 3.9–3.13 across macOS, Linux, and Windows architectures, reducing build overhead on common platforms.
Requires Python 3.9 or later; on platforms without prebuilt wheels, a C compiler and libsecp256k1 development headers are needed.
License in practice
Dual-licensed under MIT or Apache-2.0, both permissive licenses; you may choose either license when using or redistributing the package.
Quickstart
pip install coincurve
from coincurve import PrivateKey
private_key = PrivateKey()
public_key = private_key.public_key
signature = private_key.sign(b'message')Verify before relying
- Whether the package supports key derivation (BIP32/BIP44) or only basic signing and verification operations.
- Performance characteristics compared to pure-Python elliptic curve libraries for typical workloads.
- Full API surface for ECDH, Schnorr signatures, and other operations beyond basic signing.
Package facts
| License | MIT OR Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 524 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 3,254,947 / month, #2,683 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseLicense :: OSI Approved :: MIT LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Security :: CryptographyTopic :: Software Development :: Libraries |
Evidence: coincurve-21.0.0-cp310-cp310-macosx_10_9_x86_64.whl; coincurve-21.0.0-cp310-cp310-macosx_11_0_arm64.whl; coincurve-21.0.0-cp310-cp310-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_17_i686.manylinux2014_i686.whl; coincurve-21.0.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl; coincurve-21.0.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; coincurve-21.0.0-cp310-cp310-musllinux_1_2_aarch64.whl; coincurve-21.0.0-cp310-cp310-musllinux_1_2_i686.whl; coincurve-21.0.0-cp310-cp310-musllinux_1_2_x86_64.whl; coincurve-21.0.0-cp310-cp310-win_amd64.whl; coincurve-21.0.0-cp310-cp310-win_arm64.whl; coincurve-21.0.0-cp311-cp311-macosx_10_9_x86_64.whl; coincurve-21.0.0-cp311-cp311-macosx_11_0_arm64.whl; coincurve-21.0.0-cp311-cp311-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_17_i686.manylinux2014_i686.whl; coincurve-21.0.0-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl; coincurve-21.0.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; coincurve-21.0.0-cp311-cp311-musllinux_1_2_aarch64.whl; coincurve-21.0.0-cp311-cp311-musllinux_1_2_i686.whl; coincurve-21.0.0-cp311-cp311-musllinux_1_2_x86_64.whl; coincurve-21.0.0-cp311-cp311-win_amd64.whl; coincurve-21.0.0-cp311-cp311-win_arm64.whl
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See also py-ecc · ecdsa · sslcrypto · fastecdsa · eth-keys · crypto-cpp-py · ckzg · ECPy · eciespy · slip10