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 0x88a7f8d8e574d26b807d69e4703f53ec2e3b71af4f8ad2386c7ec7bdee504f10. 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/20f5d6a7-823b-4bd5-b07f-0fe2d5163e6c.json and https://artists.proofprofile.net/proofs/artist/20f5d6a7-823b-4bd5-b07f-0fe2d5163e6c.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 0x0452ec0dd2248ecf602d0a589034683db16a7f62ef53edfe2e0033e6a270756e. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZDA72375312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e328c479f22339b1798a85899cc9538d61ca069dcfb7cd01062f306ca4c4d17. 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/USDY42242155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2efcf5f6bef4e1d4d7c208889d7c5b3d6b1fb03c29e84cef4813c6c8a365a7. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USDY42224966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a9e80c588b00b0e0bebb58d35d71429b41b4fadaa906f569ee0b8a91c3de2a. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/USDY42275646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375fe70ec6fdedf0df295a9a18a49627db5708b4b23c50d0957fad603afbb021. 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/USHM22250003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe173092648eda3654cf4f0b1a6769666379fb4b31fa9d1eec8821c9edcd32f87. 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/USHM82219710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3680efe325ae809edfb3f68b1519082bc6a1954e8fdc7d4e359e6934b84c4d. 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/QZTAY2259832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01fb124ce8fd712b9550ddfaf5fda3774381c43c13af58911b4c5bcaae6875e. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZFYY2306777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e20033e7f232c2814355b7fa2d7f9f45e77105163c38eadf5c3331f172bbb22. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZDA72374643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9270b83af78aaa20fcacde8c649f530738cddbb086f87b256a62796a040b1961. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHN82391743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a18e7651efd61c419171152a1063151e5f94a29b0441455d5fa0ea33a13b8e6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWQ2363056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560ab515ede06b26c69c4040095e9b47958208b900eb4e8c61182db2646cd932. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZNWX2385758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71d4fd804fd4781b023f829e6d3b3e571141257aa8bcd22f7d577423d40b137. 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/QZTAU2307475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a44fa5eae3e381bcfea2542396e9c50605c7d771dde96380efd47b21280f9b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAU2307476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc44f886de075b7c86afafbb234cf234401ee9b1a3ac78bf3a45f9686a5c7ec. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZTB32303823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1480c42c7bcc65cd08f59ce452fe4466e645526cc5035361cd4f7d203d5587. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB72334867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c938f9b6e9c8e8d1fd36a48d1bbd03053cd5c65c2e2f8f28477323e008210e. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZTBF2328580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cefd07da4b2a55bf235e84f5cbb3638b46ed177300dae2cf649f0ab6386ffd3. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBF2328581.