UPolo, the British University Water Polo League, aims to improve the standard of water polo in UK by giving university teams more opportunity to play at a competitive level. The league, which runs dur
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd758de07c8e2d4ca0f3b81fdf65fa16d80397c6e243301052500d1e9c0fcf1. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/811a6d69-63f1-47eb-9a1d-ad7518d959fa.json and https://artists.proofprofile.net/proofs/artist/811a6d69-63f1-47eb-9a1d-ad7518d959fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).