Every day, hashed and kept.

HOW TO VERIFY

1. I

   Fetch

   GET /api/snapshot/{date} returns the full JSON snapshot and its SHA-256 hash.

2. II

   Hash locally

   SHA-256 the snapshot JSON (pretty-printed, 2-space indent). Compare to contentHash.

3. III

   Verify on IPFS

   If a CID is present, fetch it from any gateway. The content is immutable.

# Python verification
import hashlib, json, requests
data     = requests.get("https://noosphereprime.space/api/snapshot/2026-06-03").json()
computed = hashlib.sha256(json.dumps(data["snapshot"], indent=2).encode()).hexdigest()
assert computed == data["contentHash"], "Hash mismatch!"
print("Verified:", computed[:16], "…")