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 0x0d5f30adcb3773daf069bd8f4d259b3388e59eb7e2af01de9213b6e722fa13ce. 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/4f76f92f-2351-44a3-98a5-f9fd54a5ed19.json and https://artists.proofprofile.net/proofs/artist/4f76f92f-2351-44a3-98a5-f9fd54a5ed19.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 0x85066766f77972d0fe43ecd52f69fcc129d080fed4b71bd996ce17edc6c15f37. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTAZ2427909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e16fd90419306311a064fdca9eec8d120e880165802383a6002788798c23fb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFYX2541692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1dafca9ac1234379ca1ec2541b776cbb14d07e23509bd741f263cbb9b89e808. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFYX2541693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f71ecf14e6674651d3e4ca1fa344c142d4e37be4b6a4ec6461907ef7470b30. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFYX2541694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127b6fd84daddeccedaf70554298661a34c138a90932c47962db188d3a24c547. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZFYX2541695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d60b4264c175e56f0cd85985490e47269ff523ad50019b5abeb87dadf5d745. 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/QZFYX2541696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95628dde45957106626f26c406c8cc17cb40e36b998335e98f843de348e9e6d1. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZFYY2507713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8ee342eaca45af65794aede46e5d3ca7d821492e6591deb308def736f22b53. 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/QZHN32562174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1292b423c13a9d4d9c181358f8033cbb887fe3d1f70d36dbb0c8d9957dd26923. 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/QZHN32562175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0f15b4f1ff68aa19fd560d5f9c9b5d7f7e76c8a1206d5f62b8622db2c6206d. 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/QZHN32562176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952887698c95e6369a4369e8246700838e545849b373a3ba5409972c40ecf81e. 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/QZK6G2504634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4506d1794f03b4dfb38d0f48030be1f4365d9f08edcf63451bc21c9a69e747. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZTBA2561898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed95d3be194452bbebc342694e8a95566a2f769c625de5ff9180f45885d6fe68. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTBA2557881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4234cf783d936e9fe2ba3179c42c235dba2e804d9b2057203191c60060348eb3. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZTBA2561908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90cda6dbf754d23db4071157060b3c5d1fa8b0dad0744719cb97a3d6fca6fc5. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZZ792522938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f0d15a69c7d82d1f4e0856074527616a594804f4ae8b9710ba4ca2f921e483. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZZ7X2516139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce96d9b4163c3b1cdfb2be5d66ac4594c2d56f4e8912c8bf9670c7cff0f7140. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CH7812548504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022c72e57bc5dc0f51d487e2ad63075e7c265cb8a29687918f70c0c4df192ed5. 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/QT3F32513004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784c616b62a9be187aaa9a1e1698a317bbccf8073ed2e91ac0a05ac246cca451. 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/QT3F72593325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb327a37763a3ed6392687f6571325fcb37be539b7eebb2834bb95e79e2fd5cba. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT3F72579887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1679cc24e3fd653ac7d6b950654ea5fcca92fc8f744c67a4e1e9547223a6ef72. 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/QT3F72579882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac29c45a54246699af93687ff939fa9f249042870000e6f003ebe252ddaea182. 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/QT3F72579886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9345f87dccdb96153289bbb92357cfac3b138d938368f6d1e04573897cdde9. 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/QT3F72579885.