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 0x557f3ba7d392e235002946eefef8c136cb6a934db8c302cbd464a96d2fd9cc65. 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/5a1c180e-28b6-4510-ae47-e81de1974e12.json and https://artists.proofprofile.net/proofs/artist/5a1c180e-28b6-4510-ae47-e81de1974e12.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 0x24fe52150a2b698da05191dda9e910125da588f59c8442a96485b13fe8c5e019. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USI4R0908766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebd51295b4e3d4ee268f39ab2d9aca76486429db9622c7b257e0ad91d48f631. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USI4R1020922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc37c6cfb25f7354c7c90cb69c3fc246cfd569161ea0f60bdcf7f28b506cdff. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USI4R1020923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26caee8c9ca132003e243059983e6592e24009d0ffba4ae2aa3715172ba0b5d. 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/USI4R1020925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc34de3d7293216508553f4887784760b9a7fc7dcd4109976e548b9f0ae04b6. 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/USI4R0908767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8a7f02dba788de45653bfb6a77f830f9f928fa03500decf7aa31ebf177eb08. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USI4R0908768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f8d2fefd024e0aaf359a295adc20f12fc8ec7e14266e19d177c3bbc90c73a5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USI4R0908774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bde6ac450b74aa44a963bd0913fc194c6c3d60c70a24486be23794fbba38c5. 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/USI4R0908776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf29c1333c7a4ca538045e93458173b288441b688a13c58ae280323250f8c70. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USI4R1020928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6e794099fce4bb32a7ec315e7205e3f2397dcc1f35eea546fce0a469f12d78. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USI4R0908770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd933a62bc2b364b9eb39b2f59da11b286c09ad2b35a31ab54578ca1cc6033082. 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/USV291376030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42416abb2b338073aa7d895a6fb48af466678a2376f45f597accede8bd795bbb. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/USV291376033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3824b51a4cbdbe2b707732cc320bc4ceb42dc2097a0e2364a3487cbc35583cd8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USV291376035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84080a02df51ca04f6f7c2f3ca2320659765f22e19911677374ff0815be9e72c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USV291376036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3aa2290f0a9c74e765c2a81f4c9c3533f91c1a1251870211eeaaa26351bdd4. 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/USV291376040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ced23eb9021e6a8d5c07ff0e9bc64e2ed6cec9d9ec66b3cd73eb37e739beb3d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USV291376041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb500b8cf0f6f2fcf1152b104900e47ef3ba3abca358859ee6fd7edde9dd9d1. 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/USV291376042.