HV71 (), often referred to as just HV, is a Swedish professional ice hockey club based in Jönköping, playing in the Swedish Hockey League (SHL), the first tier of Swedish ice hockey. The team played i
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d5400ddd16c71a6b7246d424efadffa85dd47c326dc1b95457a1b54a89b4ce. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a3c0090-f42c-47af-901e-2d519c5e546f.json and https://artists.proofprofile.net/proofs/artist/1a3c0090-f42c-47af-901e-2d519c5e546f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).