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 0x00e8292a6af298fb6620055206fe4a78249ac3955f8f2550ed5fbd177c308825. 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/1dcfa6dd-305b-48e4-af8a-4b38cfe5d722.json and https://artists.proofprofile.net/proofs/artist/1dcfa6dd-305b-48e4-af8a-4b38cfe5d722.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 0xfc1751a8932edacf640b16d8f58ca8128d1a7f6125a3a1f00503ff77f2533366. 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/AUMEV2253104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f36396b9f0f1ec511080971411b410898c705ea82e0190d123dc147ab8c93b. 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/AUGBT2334335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c783a0a6e9bdb6abfe45b4f49fba543144ae0595d3ea97d312f9a5d2bca004. 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/AUMEV2328953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c470672b7ccbee62d5a658607ad16cd8ae0732f85948fffbadb901fea498eb0. 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/AUMEV2288864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de1817d67c05738136e516e0863bf810d5b912b390ba5562240151f395b72a6. 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/AUMEV2239922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7761e1ef88cd37ea8bd940f4647d06484799cc6b52c60ebe8fabed17c11a4a0d. 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/QZNMV2143797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a58f7ed0f8a334f2dff3cd451b68af080f0d241f1cc0df857afe5d7ac4c470. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBMA21898396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2be9f5f36b2d878e0575830bebc98ce83055a91465ab567526534dbba4e345. 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/GBLFP1884855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa150dbeff8136c762aaf6f4e0b3ab85e1fd4e6d09986cb4e57480607237b2154. 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/GBX721800050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52588bd7e35b34673a003733b2f6e08844f564a9a63d0ff1f69a8871c4f11c9f. 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/GBX721700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f1638ccb5e083914651c96cb10700ede867b8f63c26d195fd501e3fac8b8e9. 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/GBX721700194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc334fd408702071aefaa690ba424f3872c00ea01e5f4117d8a5e20d877cae586. 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/GBX721700195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fe3d5a846c5251eca189965c7af65c19ce556c15a813c38fed6c5546a87f20. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCACW1777818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc772c8ba7e89041fa1807fc4699c2a03751c5a92ab80cb3879c1f4ffc633fe26. 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/TCACT1692876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9edd354437d9ca2528ae791a3aed7fa5afdbc507e6f4929acbce50bcd04d06. 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/TCACR1650622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad710e11492b073c5b73ec7c508143f04021e1421e323a787e80500301f4c0a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACR1625674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10ff1ee28861738818ee5dc48f90b77b814b357abfc215bdbce95f3f8788033. 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/QZDA42237443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919438f7c8f76dea34f17cb8f3f7ad2b3e06aa101797ac01421033097627c1a0. 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/UKGDC1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145b43d09fa8909578b669dd992324404440d6d27079ed6a3911c131aaa8c45a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCADP1894092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d71db482a7a7a6c1407877c893fc26507b47682988fa92d441bd90e8a453b24. 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/QZDA42237444.