Herbert Schäfer (16 August 1927 – 6 May 1991) was a German international footballer who played for Sportfreunde Siegen. He also competed in the 1952 Summer Olympics and in the 1956 Summer Olympics. He
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 0x71829cfd2e020d3b663066a0e41148da52b2c8a68a9091324334608c41ae02c9. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bdc7e7f4-f3ea-4ebb-a65d-b4a53ce1ddca.json and https://artists.proofprofile.net/proofs/artist/bdc7e7f4-f3ea-4ebb-a65d-b4a53ce1ddca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).