Ethan Heilman

Most active in

1. Algorithm Agility for Bitcoin to maintain security in the face of quantum and classic breaks in the signature algorithms 11 of 45, 2026
2. Signing a Bitcoin Transaction with Lamport Signatures (no changes needed) 7 of 23, 2024
3. Human meaningful witness versioning 4 of 9, 2025
4. In defense of a PQ output type 4 of 36, 2026
5. SHA1 collisions make Git vulnerable to attakcs by third-parties, not just repo maintainers 3 of 32, 2017
6. Improving SPV security with PoW fraud proofs 3 of 13, 2019
7. Continuing the discussion about noinput / anyprevout 3 of 36, 2019
8. Proposed BIP for OP_CAT 3 of 20, 2023
9. Updated BIP for OP_CAT 3 of 4, 2024
10. ColliderScript: Covenants in Bitcoin via 160-bit hash collisions 3 of 5, 2024
11. Post Quantum Signatures and Scaling Bitcoin 3 of 8, 2025
12. Time to worry about 80-bit collision attacks or not? 2 of 34, 2016
13. BIP 151 use of HMAC_SHA512 2 of 59, 2016
14. A proposal to reintroduce the disabled script opcodes 2 of 6, 2017
15. OP_CAT Makes Bitcoin Quantum Secure [was CheckSigFromStack for Arithmetic Values] 2 of 6, 2021