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 0xd16d41848c56813dc96f3dfce364187f04febfd961bd42324fb02f620395048b. 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/4e464f4a-ab62-4da7-bec5-8b766385c691.json and https://artists.proofprofile.net/proofs/artist/4e464f4a-ab62-4da7-bec5-8b766385c691.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 0xe63a8ffd3db54147b814bca5aa90d1b6db8547c89e9be0aab77e74cb148bc904. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCADP1843796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94da050e7453d00111ffcc98bcaee2b1bbf4ff6de7803bb0a8ea79743607ca5f. 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/TCADT1875867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec31025a43222f816358a11247d45fc2df3121b18080a0fd53d4a29ef22c29cb. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/TCADW1851925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58fd973f043032c0736159834749f9fef04bbc7bae70a18f463fcb37563e258. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCADW1851926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69edcaad94363360c2a89fda88d44baa81e0d1417563582f68275cc264a84ef. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADW1851927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95eb91be5f69e42f8254e222b2ebe76b6a56fec1f5b7ecc0905e32441c5e8cf. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/TCADW1851937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6178b357ef7022be7dc6fac97cc7f2b7b1c5f392e2f3654bf5cb6d9c5291557f. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCADW1851940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74fec3d4f823a875ed9b1e8450fffb82a647f07b61161eb73cde41a10b8c136. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAEE1903253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46de90867a58e998441db1539b8df085b6d3c51af0fe89afca51272506b6f323. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/NLG661900367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32f30a67514e88de6c948b39630cdc6218732330c7aac90b0ae74bbdd4b03ec. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAEE1978869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74fec3d4f823a875ed9b1e8450fffb82a647f07b61161eb73cde41a10b8c136. 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/TCAEE1903253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5baf20a2bb2f61eae170d62745c22d0779ee3137854f988cf6f63853d4c1ed. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCAEE1978901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e7fea65738ddee6299de9b179c9ca1522bb018ea85f63f3afbe9755cbe1e37. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAEE1978906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434328758028c3020ce8fb89da2b9be4e90d5027f58e2592c95a2a68ba874125. 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/QZTB92380524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286c706c6e717a79d223c1a2bc3df9fbe9b456b124a8ec8b78c97af4295fee3b. 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/USCGJ1824171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdc6686b3683a4a93b662df668ba26cfaae50467145ade93ab60ecce38e7486. 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/NLG661900708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4946a7dadf2b0a0adb6567420701802a45b02484f978c17cd9e72e4638448653. 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/TCACT1605263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccbbe9f8df890753125c79ac291e82d6f6d1fc42a03714f198d17962c5c3f56. 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/TCADO1829305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadddc308f85291a31edc6ff348d9104e7de7d6b2e31d32e7a8df210429cc62aa. 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/NLRU71100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ccaf133be6450d55e9f744320464f196be308f3d9d2b20ee7979292e7e812c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL5HJ2100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434328758028c3020ce8fb89da2b9be4e90d5027f58e2592c95a2a68ba874125. 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/QZTB92380524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe571c47bf8193ce400d4dc6d0f6b1d96154c61dc730101ac2b1fdad9dadd70b9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWFS2448024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd8a52b90f6d795317415a2eebf04df0b91cdacad7bc42831e55fa18f9d9bd7. 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/NL3GQ2000116.