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 0x1921fbcb2f2e78e35630ad472ae92cce168edb158a2d6894214508ce7dacbcfa. 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/c232b157-7dfb-4e6f-bc81-e9219c5fff7c.json and https://artists.proofprofile.net/proofs/artist/c232b157-7dfb-4e6f-bc81-e9219c5fff7c.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 0xaeef0e0061406c00ab2d2feafb4272bb6e6f1091861965290055ccef14b39535. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:13:23Z), 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/TCADX1806495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e2a48a337744d07a978e9c2f41fe56326e8ab3566082887166fc16d5cc556e. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TCADJ1786545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a0cf99f90fc4ed068239c3cf063ddedee3cb720818221b093ce978a4eb60b6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEB1999056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cca521213b43c06a818a5affec4a7c229b1b8926b2d1ae7f160ab80f1cdd3fc. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/TCAFH2001012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8cb20d2aace1588e433949b6d38cbd5872c9d423c4986021f6213b7e588bd3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:57:29Z), 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/TCAGS2387609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b9ab4b9280b32f2ff7b161a65a77d8a1e7b57deff989389909b65fac30db79. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:31:01Z), 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/TCAGS2387615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e478d09d5ef1abf999e1050f5414438bf44b5e98dac3c6af4b641737706bc3. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAHS2335019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d5b26a8f9d530877ccd9203951d8c5d4cd52df19075a9bae13ff75ac280c24. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHS2335034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf355bf3815436069999d711ac766f4623b28fb13ae53d91fdad8b089fd56a1f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:47:05Z), 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/TCAJR2538777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21a306f3d9df7de33a108b06c5c07a7ecd7428d9819c67211ad3a2f3e52eb75. 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/TCAJR2538804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d01e589d9785b43ef6d8ef49f1dee9a46d4a768d91fee356d5e66acdd8a7f8. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:42:04Z), 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/TCAJQ2538822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ddc2659062d51d9d3e0ff016138c33519f28d378f50473946e65fb43580089. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAJQ2538839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f5978dd7cbb2cd1f7d8dd8838fb262fbb82fe23d56cc977d3a7da8f893c415. 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/TCAJQ2538847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6569e7855a72ce1c498fd59ee02939c09ed99d1afbb7e349edbf70e0970cf897. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QT6632534903.