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 0x3e61754437346b6099a9610fcf6a4f313d278a2db49d9eeda7c7ff434f663397. 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/2c6ea9f0-2b71-4156-8aaf-30380d9881a8.json and https://artists.proofprofile.net/proofs/artist/2c6ea9f0-2b71-4156-8aaf-30380d9881a8.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 0xe57104e36b88f4dcc4eeaf98370ae5c1ca70691c036429651f0e9a8f674e1f02. 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/DEAR42055063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3e63430b2e03905f10b5751fd20b5581d2e9eafd014142983ffe6d6fe2fa8d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BGA772100117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3058830e675b8e440e13c96672b4518b980a27851edfa75107283f289b93e318. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBKQU2357481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7d9627821fece30c6ec763bd06605eb679f4e32015cc98f1507837dabdfeae. 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/UKU932320090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf157c084686870cb9b9163a36c79c7372207ebe70155838b8374e4fadd6c30ab. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/UKU932320092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79da2cb59cf7b2ad27d933cc2d2adabbb03b0031bd8eabcb558a1803d6a8b349. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/UKU932420071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b404b1faeea984ec264ee39c2f13b967d11bb8c6277b0f39d1f848991f1362. 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/UKU932422587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ab7572785346d4d7c386abc004a800db2643818875ed1c11d9a14f41082f92. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/DEPI82409219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ec7bc063cdb51db8b0f232f3de7bfdeb248445d64f893c4cf98bf3c75f6b15. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/UKU932425091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8d51b3bda5221deb30381f2cf9767458fab313180e2378d755f359644e378b. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/DEY472477647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35b4711bf016c772a4fc840d3960f0f6a725357c077455ac22e9d9e5ada28bb. 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/UKU932428610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c09943df6bdda4c373c27c4c7b2412d9eb77a89d2f9e2ecb18b1a3bffd9969c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/UKU932522159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab4d613be6ac71a6407b838c36e62fe34e66e9b3df60f25f962049fc7d491f3. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/UKU932522535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab4d613be6ac71a6407b838c36e62fe34e66e9b3df60f25f962049fc7d491f3. 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/UKU932522535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf27d508d6836a4f64b18e6bfe8a18c241d4bd221adb4e3c84f7a9a402014c4. 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/UKU932522536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a382fa2a1f8e53e20628b567f154cb57b53e31755a4aa9119c2f451c45ae5f8. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKU932522537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1c7882accddc03e450e0c3fc28afdabd4806c7a0bf3a3482c2eb915f959048. 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/UKU932522538.