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 0x015328e856865207ad1637f69eb4a1c3e9823230b027a518a4523abf939658bd. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9aa17692-730f-4009-aa35-c813ba9f912a.json and https://artists.proofprofile.net/proofs/artist/9aa17692-730f-4009-aa35-c813ba9f912a.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 0x0adf6cc396a2fdcc7e388d07995091b214bdacc7ebbc906c283e860d493590dc. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USLD91745444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c6397ef9644d4015d8b8e4583a3506679c2c9265a20463d61507589f659c2d. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USLD91747202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c3643519e3f9b2cf3e785506fcd5ee34b300f83ee1b3b3650fc35326409081. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USLD91747203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fc880f4116ef809113ae8fa23af444a23dcafed8c5ecd3a6d24879a74247e. 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/USLD91746983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2380868e37bffd173170b3ffe13eb53ff735236171809e8e02eb782fe07aa6be. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USLD91747207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d78aa05a84bd128cb302d262bc5594d54ea5033b4c5bb7cfa8e19a5cfeb1022. 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/USLD91741182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45ba2dc8e9b0bc1405c81e04be3120ef0df668b62a1d3259b127b527d0a86f. 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/USLD91741183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662f1081ed26352665735c8d44133293c22fadbc13d6b87944118adb098e0572. 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/USLD91741185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7b445f7a212277a99ee07859ab6d1ac905eda558ceb9481a5a620702a1b3e6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USLD91741186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7121ba5cb45058607df35a84975513672a5fdcd1dfb5f1619f92c92b1e5959. 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/QZTAW2420828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b3d509c995868c3827c6ce163af64006dd777af8382de6d8b1740675502889. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAW2420829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe790f1b852f9a2d9c157831e742d641b9e63f174eefcf11dbfe19e722bcd227d. 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/QZTAT2483247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba77e3410e8fc1730428f056f723623fee439bd74ed4650ac11fb61e6f0198a. 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/QZMEN2420799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695b7def39f9b77247cf0fe421f2983ac61be1d45af59826e7c8b0c391088198. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZES62311171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a350532c3398894bb92ded708aafd10ed88e2dd47382fdd06e4a781f9a237e6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAID2441679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09e4b28891ce43ac0b86e381500dfc35fefb384d481bfda19ceb6c53e64851d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAHT2310067.