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 0x257cd9cbb9457a44ca88db7410219d5822cebc4f00d902ffb04806e8b61670ac. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42e8136c-c543-43b0-a1be-5296108f33e4.json and https://artists.proofprofile.net/proofs/artist/42e8136c-c543-43b0-a1be-5296108f33e4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Poldini: Marionettes, No. 2, "La Poupée valsante" (Arr. By Fritz Kreisler)
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 0x357a2cdc80f727ff3610b6510d34040f3d6fa9ba06797a486d16c60db490839c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWU710701241.
Tchaikovsky: Souvenir de Hapsal, Op. 2: No. 3, "Chanson sans paroles"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e189a6157c085d707c14dc6b493fcca119c6af5904b593fb9301f89e64d96f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWU710701242.
Kreisler: Recitativo und Scherzo-Caprice, Op. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4f888c22367db6b2556f5a6c8475a0625ddd2bccfcd07653b8f512ac36f737. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWU710701246.
Schumann: 3 Romances, Op. 94: No. 2, Einfach, innig (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c02ed2cbc84c0ee9a7da535450de9ce2cf5e63f979715f4d85ba86a5d962490. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWU710701248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca2983618749bb71e3ba8dc4702f23219b740e1fd8c7a6885022a7b1e58bc65. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWU710701249.
Heuberger: Midnight Bells (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8039c0ad783350ac2d832153785bdc5ed9f82b5f4efe6a37e7c086f88e916771. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWU710701252.
Kreisler: Praeludium and Allegro in the Style of Pugnani
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdbd83a3b197d8b7a8dcd37a590dc6117ee393944759217facf7d4610ae3459. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/TWU710701238.
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
Chaminade: Sérénade Espagnole, Op. 150 (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b46ba882b7c9b91b54ddb5cf6010790157d0194cc8a70310a62ad8ce6e48fa6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWU710701239.
Dvořákr: 8 Humoresques, Op. 101: No.7, Poco lento e grazioso (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b3d0dc950c93388f1efb63ea9d0f47f6c0372efde917986a6f880a216a377c. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/TWU710701240.
Mendelssohn: Lieder ohne Worte, Op. 62: No. 1, Andante espressivo (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca75a1b35bfb69c06667cc4f308c65beac521c9cdae24801a8810a7f62f9611d. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/TWU710701244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0589ff5fd8568d9e3fbdded1b44f4cdcdb6649175436fee1bb761bd15ab3b3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWU710701245.
Weber: Violin Sonata in F Major, J. 99: II. Larghetto (Arr. by Fritz Kreisler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d85805023ec5492809df3a5150faab69138242b93d6b19f55701ec4c171dbd8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWU710701247.
Kreisler: Three Old Viennese Dances: No. 2, "Liebesleid"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde9bd6a9c1aeae3df4b98ceb3c4107a30f0f859fd5680ebaea2707911faa260. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/TWU710701250.
Kreisler: Three Old Viennese Dances: No. 1, "Liebesfreud"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec1aa309a3a6454e56e6958c8beded3a95bd0e245f5139aeee6353c2c41ae5b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWU710701251.