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 0x1fff3fc8cb2f26a470fa8a2c550b2ea09b6ec422683e538793391aeff0514e0b. 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/7a5ad88e-0e1b-4517-8b52-c164968a8f22.json and https://artists.proofprofile.net/proofs/artist/7a5ad88e-0e1b-4517-8b52-c164968a8f22.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 0xb3e8da01a49cd104503e4629009b5bfecd02638d56fb26b9d6cc24a9601b2c2c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZJDW1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f6a0b9381e0adac18a4425bbfbe77e125fec647a8779a3a4ac48e1efc1edf9. 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/QZGLS2440379.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fd7dd721ed9752d0e4df98572102be81851921c4e752e8804385f5b08a6d96. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFJ2319841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3365c85057101946b894ef810d23019cc6c1f66d2c510a7af22618398982d9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFJ2319842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b6703ef671ad21381ec5201df915c7e8a220546b4da590c2924e9665b504db. 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/QZWFJ2319850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc146574bf5b8e4f81db7e378121904a482182aa5ddd16ca3fefcf5abebd948. 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/QZWFJ2319851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf107b6dc173322e6484e3fe0a8dbb5c3a4157602efffe985542cdaac5845b0ba. 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/QZWFJ2319852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb42109cab181f98d60d40195fe459388e5b62137f505119e8010f0e83864486. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAT2499124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cc7f1c9a38930ab8bcad7b84c041098ad6eeee3f32cf430871b2eb6d973826. 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/QZTAT2499125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303b79d77e367206463b94c635ed1ed2b9249a5465eda02f8a6166569bbad407. 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/QZTAT2499128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f681cb151558b6ec34f499a34b1f281f33c092f2e21f01c0fdc7d811c41015d. 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/QZTAT2499129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9087497edede068765d68ee06cc39223ab9f1ceff03a050fec49bc75213f48. 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/QZTAT2499131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f49a2e8c250568bf32f12c353d4f9504671c589ffe9ede177f42f72e3c7692e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA42433397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e7b87ea15e722a0056096745b33ba11a252e751a04372d169c3702de1eb6c4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1246042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa109f0cea442358f14e1b8d863cac2c79ab4cb35ff78c716748d29d205c3468a. 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/QM6N21830235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9195a896da69a2f13c4bdf76c8ac2d8e7626973ce6a4f217e0429be4f131d1d0. 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/TCADS1853515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0e67e9c106de9d77283253d24d3a1daf11ea4611ed6c7c56d8b7cfd3e9bba0. 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/QZZ782554263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eb3c6916c54c555f8a659ae597bbe79c4d94f22bd45aa475913dc25a04eefd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFG2576295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecada0889b78eed893b7bfb91cbfbb2293e1944e76dffe671fd7f24c64f169e. 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/QZWFG2551618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7597c6d748772d753bba6752dfaa7684e424cc0872cc9fdcab2293c103d5ffd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTB62502082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f6760ca8bd74f11fef2eb5323cfd792bdd8f7146b239fa79629514c2d238b7. 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/QZTB32521026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527946b974bf8f62a57350f361dd2ef79e34bc5a5ebf1ed2dd6e1f6b92e51ca3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAT2527421.