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 0xea57740a5e26321683eb6ec562b45bd22bd6101f01cf5cdf4f1c25a0e2d21445. 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/9c4bbab7-f164-40d2-9653-6b83eb1d4415.json and https://artists.proofprofile.net/proofs/artist/9c4bbab7-f164-40d2-9653-6b83eb1d4415.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 0xcdb9374d5a262ce5ca58a5309f6c309b032d05a235742b22785f525965a21f3d. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/GBWUL2151271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29481a6202ef7e19e4cbdf652603416a1b2d683cd1ff01e130e529a9ca68be89. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBWUL2151285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a0455872784b5ea46b3461d2ba44a38dc3c99e1534e40ccffb39e31511e662. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBWUL2151311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f59e0552011e3445efa232a30f37753e9df325e8297aacd05a1461066d11a2a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GBWUL2151342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a6492c681b1de8b463e636c10f9fd964259f3a702e54c9d14b098d1f9fa0b6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZ5FN2241372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64b895c71bd88ee57a10cf1c855485692eb351d941400db42518678c4d93234. 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/USLZJ2205130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4881e431e88157e7831f10f927151c9d52f13bcc2877f25a3efcc61e55728390. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USLZJ2205135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e665aacf627cfffd5b1d4dab6a9708dba5a5e5f40227c0539eca927278ff0bb. 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/GBWUL2274325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8453dbb8098ef958d15cea3514151c80a21e764883d3ea9e696e135810e9f326. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZTV32251005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa5e15f60cdc10a9afea360e31961c1f052206b7ab2b12cb4f26d3cffe2375f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTV32251006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22610e977ef8fb2579de7fd5006fd5fb5687a9dbb9ed4835b8b9babc7f77af6. 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/QZTV32261048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0751266754ca4c68a29b79b04d39e91b0a7e8ad367ace641e47a517cce88444. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTV32261060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4265ac134b33c1f10c291084baf217379554e1da4b7a0b8aa984c0736fc1b85. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTV32261075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6ef2a9966f0223f80bdf9bd3fcc939819c8f6805d46d297e39bdb042e9b644. 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/QZ5FN2371227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ef89bd3ad501e734ed01bc7e9e3d57b8339a8cd06a2a2b3fc884f611619ce5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTRX2326068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbb4e671521dbbca419377bf579833cd8eae087fe7c2ba55aabc0a302502805. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZZ8A2549131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0395e2030cf87cef97ae486cc811eb93a7e3830815ae8971a0e0e85f2a5a56. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZZ8A2549123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ce1c10a5a7a926265e4cf7cbe227221f29de5f49422fdfb151418d2cff3d15. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ8A2549124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ff309ee6e5f3a884e71137ad644d083b206f2b88651f4d6826032e481052c5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ8A2549126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04b44d0fa9c840517c242ecd660c199dd84539065a417a26ec92f4b7cc3aaa4. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZZ8A2549128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad900a70ea6822ae6bbed5e5fa6c7cb0c953d0fb9ee0b5c8fd7bd49900f5cde. 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/QZZ8A2549129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf665f7e15beab654ab709fc89b68f2481e7654d66f149bb6523974a113b3336. 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/QZZ8A2549132.