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 0xfc907af178ba2a848979bc5e80b7913912079654c106bb35d3a02c02f140f643. 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/8874cbf6-0c90-4bc7-b3ba-746bf23cdf7c.json and https://artists.proofprofile.net/proofs/artist/8874cbf6-0c90-4bc7-b3ba-746bf23cdf7c.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 0x30511153c7ac6aebc217ad1833a2198bca8144fc43004584f1bbdc7658b8b2d5. 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/QZHN82129092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649ad0fa1050af025cc90ee291e1cc061c6576890edc7976238d1dfab7aee4d9. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZHN82129093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9bf3e9fc0327be6712d750f83c185635b7980a2f00b4ded5eae13883bc2a9e. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZHN82129094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48b45c99df0404bb1edb457037eaad2183c5dd8a849d5193442070ea614d489. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZHN82129097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0df99bb0c0b1de0d5fd61a2ebba4998b9800e96d4139d8395eca4cb65ff3067. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHN82129098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af3d62255d8359320206a863374b5c337408d1ffd0e4f1b086f7e9ed19a7a53. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6K2126270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9b5e2e9fd81fa6ce814d91d13e7e7d9795c819e23af83ad9c2da093995f3c2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMEN2111295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51d58ef61e6c23413ad69218ef7171e4442248155cebe330515419c0dbf04045. 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/QZNWR2185233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b0f546fa7d0c36560acebaf3c45e3d2ceb23764ca8e19bb479ce820e34ef42. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWT2173513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d8094a538c6e790f23027deb6ff5a7ab6b8cfb43424e88f61884118d6e6aa2. 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/QZPLS2177394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d207457d43139c06592a48f92e57a24c2a0186c711e89098616d3358f1ad11a. 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/QZN882200918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81855ea36045a905ec23f982fcb93c66df39908ce2c24012be43af801aa7c36. 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/QZK6M2236213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4d0d1c8b6fc6afca1a9395ac2baea45558ec3fbe1e72195174ff804a3c13b5. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWV2246411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1454ef754bad6fcdfc9078b262c14fcb3a7d64102433cd82e104914e9b62e5. 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/QZFYZ2388515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e98e6db2b3e8fcafd3f9ac2bf9da42cbafd76be5f3900a2980ad63e3eeb4a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAZ2369221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eea377cefc39caaa4c962bad56efa3e62dce0dec6f381e724ae126083963e19. 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/QZWFM2374813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e67c888f6dd5baaf68727f8fae60a9ce798e762a59988f199f0391f9081281c. 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/QZDA72483918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f41d12031d385b5f47bce80ca1d207ef3af2dcc135f7caeeb23ad186b07474f. 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/QZHN82413145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b70494c81877294d957a13ebdeef85731252342ac9897293363d40a32f7c5d. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZHN82413148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537aa8fdc868809ea7bcdab9f53c721277163b24a80c78ed88a5464e1a2089a6. 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/CA5KR2463270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b26dbc11b4211a447f474c16636d7789f84e57c865eff1f2db4da76ccf29a7d. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/CA5KR2470170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33344798339bf53b209aa05f77af904d51a62edd6a0f8ec9acd54e1ee9082cbc. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZZ782400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5e03133153c095675add1eae547df126ba51736258aa5b0817800c1629cef3. 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/QZFYZ2530227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7b026ca08b813817a3a53f096516cd518f47a568c0f8d499a24b9617e6c0fd. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZVEM2527253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a31df85e87d4e29c59709071204690fad3c6e3e824b4f737dccccabec27cac3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZNWQ2567530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a2b966df108c80d65eb2f820cf450e22e28fe786767293c479334df0430d73. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZPLR2569002.