thumb|Tadeusz Wojciechowski Tadeusz Wojciechowski (b. 13 June 1838 in Kraków, d. 21 November 1919 in Lwów) was a Polish historian, professor, and rector of the University of Lwów (now Lviv, Ukraine;
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 0xb58b780ea7fb4723b9d2932a8ef9529ca41578bac7d01af9925380ffefabfa49. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3520cb90-f38d-4985-b6b9-bd0adf444d18.json and https://artists.proofprofile.net/proofs/artist/3520cb90-f38d-4985-b6b9-bd0adf444d18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Peer Gynt Suite No. 1, Op. 46: I. Morning Mood
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 0x81e7930fa7de1d6daf011682b50be655742b076318459d09a67dd274a54d984f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBARU9500008.
Grieg: Piano Concerto, Symphonic Dances, Lyric Pieces, Holgberg Suite, Peer Gynt Suites
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e7930fa7de1d6daf011682b50be655742b076318459d09a67dd274a54d984f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBARU9500008.
Piano Concerto in A Minor, Op. 16: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62707dd74cb51ac1973abdad61197dd5c1d1252c010acd6622ede6eab358b7b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBARU9500050.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Peer Gynt Suite No. 2, Op. 55: Solveig's Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc928afa86b80796347397399525a3017f7c9ef3600e7febf9c95d34f78a6fbc0. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBARU9500015.