···11# The did:cow Method Specification v0.1
2233**Status:** Draft Specification
44+55+**Author:** Edmund Edgar ( [goat.navy](https://bsky.app/profile/goat.navy) )
66+47**Date:** March 10th, 2026
55-**DAuthor:** Edmund Edgar (goat.navy)
6879## Abstract
810···159161160162## 9. Reference Implementation
161163162162-Deployed on Sepolia testnet: `0x8bd78c8CdCcF951169bbF964A0aCC241Be63B05f`
164164+Deployed on Sepolia testnet: (`0x8bd78c8CdCcF951169bbF964A0aCC241Be63B05f`)[https://sepolia.etherscan.io/address/0x8bd78c8CdCcF951169bbF964A0aCC241Be63B05f]
163165164166**Contract functions (`CowRegistry.sol`):**
165167- `calculateCowHash(controller, wrappedDID)` — derive the registry key for a cow