Sportsguitar is a Swiss band formed in Lucerne in 1993. The band is centered on singer and guitarist Oliver Obert and guitarist Roland Saum, though Saum left Sportsguitar after their third album. Litt
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 0xfabced39163acf04a6b8c723f97bd03b92a6f5c9b591b9dcdf2b70a0410b0737. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9c2e441-8b0f-45db-b31a-7298764aad77.json and https://artists.proofprofile.net/proofs/artist/d9c2e441-8b0f-45db-b31a-7298764aad77.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).