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 0x0f22205a2725c8694c356599412e7a6593b7e754b8205c699e2875d1a8c15dcb. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d07092a3-475a-43d8-b9df-08570474ef39.json and https://artists.proofprofile.net/proofs/artist/d07092a3-475a-43d8-b9df-08570474ef39.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 0xc14a57eed263c55295dd4af0cc6fd73be79ae21aac7c4327fc335fc8019125ea. 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/QZTAZ2441183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665ce602fdeb85d2d9f26616e5c49c23cca761d5e58672a40db17b275169330c. 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/QZK6J2401065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34393e7f1d22ab513d2914cdffd438703374f4c8009eae91c097f1b882907c22. 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/QZDA52327500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6502309d0d7dbcdd32a8e60956f3fe876a53349c8e8ecd1f47ffb38da73530de. 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/QZFYZ2376128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeead9205a14023cdd01fa5955ff2316b26c3a8ac2c106cd4fa574312b722a396. 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/QZTAS2235928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad3d89b9420cc45093387e9f2ce2314fd83a5f29f327c9f20cb666188030930. 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/QZNWR2282490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6a1b295f388fe96eeb9c8929b1fae9508b25bcf48220a9178c50da2cc8fcdb. 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/QZK6F2173326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e4983eafd3f9f8a2455f81f6519c9348d2d7fbce6fcfc870a4ca74499f74e0. 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/QZPLR2060734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb506444047b79b29f4f247f5f67266f7c4f3c02cfadbd619da286f4aea36cda6. 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/QZNWW2054224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf54ac3224a76d2f1b1836e5881d950b7b3538ce61c2dd2b97398e83f1e729a6. 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/QZNWU2077297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba659170112d271f04be1cc747f736cbd19e112647c1cb3a319e2a63494f9d3. 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/QZHN62096870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9a9e9be993b9a96b35ef4d85aaeb3112902703e5c7513356372ae7468ff681. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:59:37Z), 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/QZHNA1907004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e04929440396a22384be4d639ad62ae257904932050a5e172fa464fb706c03. 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/USCGH2064096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38c18131b2a51c820796543df97d47201a4cb71d6e5c1f498dae23e8750bd81. 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/NL5MF2103428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57819ac830a0944bf79d8946a828f8af6369bd5098890df17e6e055884a738c. 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/QZNWQ2505974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d92d862022e6d591e23f1be962167dba274f01bd5938945830cd96d1accdb6. 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/QZDA62585005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8b49728dcef6d8445ea5f83b023d8d839a769942eaa67a0d081fad4663f041. 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/QZWFR2427714.