⛓ No one can tamper with your picks.
Not even us. Every time a player saves their predictions, a permanent fingerprint is written to the Hedera Blockchain Testnet — a public distributed ledger with no single owner. Once written, it cannot be changed or deleted by anyone.
This page lets you — or any auditor — check independently that what's in our database exactly matches what's on the blockchain. Your browser fetches the original record directly from Hedera's servers and re-computes the fingerprint locally. You never have to take our word for it.
How the check works
- We show you the batch record from our database — which Hedera topic, which sequence number, and the SHA-256 fingerprint we stored at submission time.
- Your browser fetches that same message directly from Hedera's public Mirror Node — we are not involved in that request.
- Your browser re-computes the SHA-256 fingerprint of the raw message bytes using your device's own Web Crypto API.
- If both fingerprints match ✅ — the picks are intact, exactly as submitted. If they don't ❌ — something was changed after submission.
Query Hedera directly
You can also verify any batch manually. Each batch card shows a “View raw record on Hedera Blockchain Testnet” link, or paste this into your browser:
https://testnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{seqNo}