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 0xc62dd881a385b201892d705942ee2c0d9224900ab8c110c62692cd0178c69f7e. 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/e228bc44-7cd2-4c56-801a-450ab3fdd144.json and https://artists.proofprofile.net/proofs/artist/e228bc44-7cd2-4c56-801a-450ab3fdd144.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 0xe97ddd58858d9f1ad313a69ce651e2ee21c5895f2435b440be742d5d1f2c7826. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USTCF1033270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914c07409409b27ab5b8873e6d97e538ed23c2a504dbc521a75463d2a9b20f04. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USTCF1033271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd947d143e199a35ce6fb61655047259376b193f4060a6a2b30330d211f3906a6. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USTCF1033272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc909b8118eb2da476f815b4055a8184e99306e36997eeb3582ff76653d265495. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USTCF1033273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66f4343c4b703c6ed46830651fe668b4398e5dc4c739d9b3a2ef1d394a3aeaa. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCABL1209706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28af303ac43fc45d6e4ea70ed00f2224986e261e4cef1586a9afe1f90499368. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCABL1209708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94effbd5b9fa2ece29309ca57798a406ad98c622fb294545d5b9ac2f4b0b1b42. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCABL1209709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d235e3f109f287fbcaf7c57e7e53f0ef400e3a0d1d9450141dd665cd64363f5. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCABL1209711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4362879d2c86520cff205bf11c818a9471a9ccad908769f974bda7280625140d. 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/TCABL1209714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50acc5b3f43daacc43fb597719e483d83ee921499337a94bde8f5fbd37bd5901. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMGVJ1400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71c104124a24706829be5fe69edec3ebcfb3a0056a95d86a962f87b3e5cbde4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QMGVJ1400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fd8cf7d3deff71de5467205e7a20c1dc2a08946bc7c2e141459a28be1c8c19. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QMGVJ1400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbfdd8e1d4a2198a19da4cc08938c90de7bd66042e285d19b9f100ef18317d4. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QMGVJ1400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24c6a3e9d420d19d09f666242a1075f4f94e0e72965a344736a907793124e3f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMGVJ1600057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28960e9f92fd179221c0553c5abf149da12a2db5df7c426d16c32420f9238812. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QMGVJ1600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434ff70989041c4ad6ca1f7cd678fbedf14d7df3f379e958233e5729fbf40de2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMGVJ1600060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01764850614205aebeaf8838b29b4cf54fbaf6f64411bb0863ddb487e6d6a914. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMGVJ1400208.