Robert Schumann (; ; 8 June 181029 July 1856) was a German composer, pianist, and music critic of the early Romantic era. He composed in all the main musical genres of the time, writing for solo piano
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 0x80f73fc60398d8da98a778363863fc7e3264e920e68f9affa470a1d318325e88. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a0b21c8-aafd-415e-9ece-63775719d30f.json and https://artists.proofprofile.net/proofs/artist/9a0b21c8-aafd-415e-9ece-63775719d30f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).