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 0xbf47f534515ee867b67ef55beba74d11ffbfd15505a87cc3564c019372021b86. 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/5d27a9c7-6b04-4005-b57d-8d94ae20f5bd.json and https://artists.proofprofile.net/proofs/artist/5d27a9c7-6b04-4005-b57d-8d94ae20f5bd.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 0xfec4f1a5d20c176f93f2df004557e376bef3446b3b1a9ca64a087a0cf0d2b714. 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/ESA012166619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf1940d2b865b10d85fadadce1f61c3e236c3a5aa7266b4a95a89039b728440. 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/ESA012256054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3d312dde15cd9a730de04ff90cf84a07f9dfa3ee321bf16f48a2062d6751f1. 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/QMFME2247835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5431bbb7bf79df6873f9e6d7db531be0bb67ce896cb45f9bf853f7456715c7. 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/GBLFP2243574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f7c6ada327c1276b6acad73a4457ff49b22bfb91bf82cc9990a636bf48d243. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES8022400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe91facbf5a4ba7de75d654d89964d53885e1ad168c9e45cf4394a58ae6044c4. 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/ES8022400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561b844b202e4b63726dbe8f7dbb51ed2f4c1856432f6a1ca0f7984f892bcb4d. 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/ES8022400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a26d35206eea77add0b7e1ebef60d4f70d592465926d843b4a318269d23147. 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/ES8022400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171a163be59017d085b9aa8d1354520fa4dface2d30def808e0adca53ac2e189. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES8022400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630b64b1db850eb5ef1ca76672d53b1c2ce9ec4b2ab5bc6f6b8ada36e42e8d6b. 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/ES8022400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561b844b202e4b63726dbe8f7dbb51ed2f4c1856432f6a1ca0f7984f892bcb4d. 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/ES8022400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a544218c9b51261fa1c68a613cddb604c87622e9a3886a44add2d98bfd403ab. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/ESA092321713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5431bbb7bf79df6873f9e6d7db531be0bb67ce896cb45f9bf853f7456715c7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLFP2243574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a39c673f8ec5ecde647a4b349c044a728df79344aaa7a15e16a035b3cd2ebb7. 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/ESA011589155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16317cce6f482160ab998dbe5592f5279139fc7a5812d6310996bcce8d89353a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNWX2409782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f1d5894080cfcbaff755d0d154cbb265dc985b9e3bc910e92eb11c9e8bba3e. 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/ES8022500071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43f8171230fd5f05272e210d275457a34bd1b9e16d8d2d615528b9c6dac5eff. 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/ES8022500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6264bba25f5611eb49104c66c737512b771e0aa5ffde334a282ed7b4feaffff. 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/ES8022500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00295cdd33969af849ce131bed0734d2dface5ea16332fadc5cbc7f3d22cc091. 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/ES8022500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f05194121bb4b51d0bebb65759c7c4332f9a73277ed0f3548b005a240a06a4. 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/ES8022500075.