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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c34b0542320d7541707ec12d579313279a443b86a55c4ce6306dfce6397adf0. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/369cd322-760c-4e13-8789-2606747cdd77.json and https://artists.proofprofile.net/proofs/artist/369cd322-760c-4e13-8789-2606747cdd77.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33878649e9f01e5262dd46b5e2e5a8d7183cafe2703bf0d8115e795fc970cac. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6L2292625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bca7ccd923f17dc4c986952af4f2de094e844db9c496f394f388aeddfb2cc6b. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTAU2220699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30076cc84d6093ed6235bef6ae32ed808298354acf1557c2e316aacea59b0e0. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZTB92213747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bbf9b3e67160139532cf04676185e94153c0c8225d447cf14c713b88df8815. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZES52395398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1c5c644547c29e5c2d06130c7977f714addd1bf921e40be631dd2d306c2118. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZES52395400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb03ae5930d2ff7638105ade4a0fa7a7c3cd60444212d204fd6c9e5aa7dfa4c. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZES52395402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d44ab8e87b338261ff26a4af11156f83a0f4631841757954311f99ac69df1d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES52395403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf58b3a0684c459997698edcb69f3d5f7460995e934a4635533817b6fb530562. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWY2357877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd6bd6f35f31973c8ce57e0e3bd8ce3e8c0d6a33679697a805a07c31002ea28. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTBB2392379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40902c0d50a0c697b9bd8081ce1ec62ed6fc96b5712d1bb1aced36d13782ec13. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FRPZ92429040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea5b4edbd904d9f3a9cef987b478d565bdf1812ea769c8d120aef427335d7ec. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/FRPZ92429020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc4584af4dc5fce495ece63515419656fcc8b6b6db97d84132f51a515af747e. 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/FRPZ92438380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3909b9dfb3e4c763815850272b4accec8fb2bb29e5744c1d76cc406cc2340074. 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/FRPZ92436410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a418c2dbda319e7985fc93ec378a14a7b9a8dd281f936037f2c5f6db317558. 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/FRPZ92438370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc4584af4dc5fce495ece63515419656fcc8b6b6db97d84132f51a515af747e. 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/FRPZ92438380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a113230960af1dee2a508e2a11ca9685fcb5f4d10e9fbdbe70b388ac549a1db. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FRPZ92438390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270f282b1ea8644c2130f53f57972a1706e7020fca462fa7bead779f1bc7f243. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FRPZ92438400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04ce81ce460018775134787b72c8afee2b79015ccbb10b981b2bbdd716d16e7. 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/FRPZ92438410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4da6b85f381e26d6a04da842c37340f300e7cddf2fa1ad764b8c23d60415ab4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRPZ92438420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacaa171b7842be9e2b82be8dafafee68fb13538dc0a3b17013a8a911c4cbbb79. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FRPZ92438430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03199921ee2d7f0929d08b13b5c87b1b5b62fa7ea81f346ff7ba19a425383f25. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRPZ92438440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398f74d3ecba42cf46f75cfef09703675906db05b788f9058e5d74c82996d0b9. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FRPZ92438450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d82352378055c45732b846d1e1ebffa93762ba8c051cc1eb7117ef5d48c285d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRPZ92510830.