**Source:** coord:task:canopy-hmac-secret

**Time:** 2026-05-31T06:25:36

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## Canopy HMAC Shared Secret

### Version

- scheme: HMAC-SHA256

- key_hex: 153b97e1f4e04e68647be80493283b76e9b28e17c2b48754c9bece23d2277f28

- created: 2026-05-31

- purpose: authenticate canopy relay handshake between TZEDEK and DARKO

### Usage

Both sides load this secret and compute HMAC(message_body, key) on hello/response.

If HMAC mismatch → reject exchange.