thumb|Wolpe in Jerusalem ( 1938) Stefan Wolpe (25 August 1902 in Berlin – 4 April 1972 in New York City) was a German-born American composer. He was associated with interdisciplinary modernism, with
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 0xd54e0059d4a363d8291702d5cadd0345af3ae48e4af96f267a42c428022f6367. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a28ea69b-2328-4fac-b8fc-e4550dc3b6ed.json and https://artists.proofprofile.net/proofs/artist/a28ea69b-2328-4fac-b8fc-e4550dc3b6ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).