ECDSA on sect571r1
The Elliptic Curve Digital Signature Algorithm over sect571r1, a 571-bit binary-field curve defined in SEC 2 and known to NIST as B-571. Nexus's original coin layer, before signature chains, signs with it. A larger curve raises the classical cost of attack but not the quantum one: Shor's algorithm on a cryptographically relevant quantum computer recovers the private key from the public key.
- Quantum status
- Broken by Shor's algorithm
- Standard
- SEC 2, final
- Family
- elliptic curve
- Also known as
- sect571r1, B-571
Rated chains using it
- Nexus Mainnet, opt-in
Account signatures, sect571r1, legacy UTXO outputs. The legacy CheckSig builds an elliptic-curve key on the default curve, NID_sect571r1 (src/LLC/eckey.cpp lines 271 to 276). Legacy transactions are still accepted in Tritium blocks; how much supply remains in legacy outputs is unmeasured. Source code or release
Sources
- SEC 2: Recommended Elliptic Curve Domain Parameters , Standards for Efficient Cryptography Group. Accessed 23 October 2026.
Published beside the Hardy Score and not an input to it. How each chain is scored is set out in the methodology.