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 0xae764c9f440db568fe3654eb9623831a33d1dadbf3ed2a88f06853a03d1a2603. 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/165e89a2-21e4-4c90-bec1-b1f37bb1028e.json and https://artists.proofprofile.net/proofs/artist/165e89a2-21e4-4c90-bec1-b1f37bb1028e.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 0x4bec98eda86521d429621cb67e7619943acad073561ae47ea0cadee7e15ae188. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLA329499990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb022a115bf32361c1993c7b64cb699fdb506874154d8198a5c4fafce188614e3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLA329499988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e04916a92c193407ea6c16adc0afdf47466ce66b7044f25342ea6844431c35. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLA329499987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a52a5972c36ad4f6c4392cab079cdcdc527f9c3950d249f3f982a4ff2e7ba21. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLA329499986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496565f59085d650220ca054dcba8ab1bc4eb0f4e2d756f460fa3f565ce05fba. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLA329499985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0008817a3d2a91cf8baeb34ed0551993367b2f08ae86db9440798e8e906c59. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLA329499984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c8e0c817e742a005956ea302609c1ae2514602f5526ff39fee7cbdcf29fa32. 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/NLA329499982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8018ec81a8bbc5514b48b675efb6b1ac29203fabcf503c22022183a7905282. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLA329499981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46b72e52ac5d503d28d792fff4fbc20ca69bd8ed0e715e34814f9df1fb5fc41. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/NLA329499980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027e1aff14cb1f32ee3f144d5598f837b1140313acb691db4a4e9bc0ad8e173e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NLA329499979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2192af5aef0688281dae80ef97780064da52b3a22cc239fac67f25665446ba8c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZJG51945082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd810325c8669f4e99790fa194278e293589b1f0ef83db5d318cdd1641854396. 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/QZJG51945087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fdfa6b3b8ab8f2784c367c1a2449d81c73c1cf27ac2bdcd6103ac6a99d476a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZJG51945088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62c6b3a43a692760a4cf98d3c90f32221d03b265d57a299efe82e209adc636f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZJG51945089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19209c3907bb8482c0e258c800a182fd3d68f1c2a1183b2b2427059a7c8979e9. 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/QZJG51945090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7397f04b1ead0516685ae0dd8b60cd3a2c596691f5b67d5998926a2f029d78d8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZJG51945091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0488cbb52f01573ee9bb9abfb3da91f3639276ea4df2ec0e3ce812641520d5a4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US2641007101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e04916a92c193407ea6c16adc0afdf47466ce66b7044f25342ea6844431c35. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLA329499987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21e3ca32225aeee50393560da8485fa98d345453c70dbafe6f3d5f053f517da. 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/NLA329499989.