Robert Bartko (born 23 December 1975) is a German former road and track cyclist, who competed professionally between 2001 and 2014. Born in the former East Germany, Bartko won two gold medals at the 2
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 0x524dd37bb83f751db92711048deb7a63131cf3f6094976794b3d27a16e128e4c. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d8039ee-afb1-4527-bd09-aeb5a98220ce.json and https://artists.proofprofile.net/proofs/artist/0d8039ee-afb1-4527-bd09-aeb5a98220ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Without Love (Long Train Runnin’), Doobie Brothers Tribute Acoustic - Single
Don’t Worry About a Thing (Three Little Birds) - Single
I Just Want to Be Your Everything (Bee Gees, Andy Gibb Acoustic Tribute) - Single
Don't Stop Believin' (Journey Cover) - Single
Last Christmas (Glee Acoustic Wham George Michael Tribute) - Single
The Forgotten (Twilight Saga Breaking Dawn Tribute, Don’t Look Away) - Acoustic - Single
Danny’s Song (Kenny Loggins & Messina Tribute, Even Though We Ain’t Got Money Acoustic) - Single
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258236b9b7e8648dc7ecb95d73bf094921b54abef306d5c676fd60bac4a72b3c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USQY51525906.