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 0x7301a52c7c3583df0efb99dd7d936db1ef705e87d8b3197963377133671174d2. 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/93d50108-030b-40da-b96f-8005abc5878b.json and https://artists.proofprofile.net/proofs/artist/93d50108-030b-40da-b96f-8005abc5878b.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 0x8879bfac6ca52681a18f3375c742c18e7a22138e7e9ca1bb716ac51d167a492b. 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/QZK6P1903733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f020df95a665f71794a79b0dfae669bdd56ca70d809ba36b7e0553f3e0b7315. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZFZ32053135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d096c1c450e620b22cc23a29d890da89d90a83135a74317dcc67a6e18f3289. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZ5FN2043766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc597c11a300788289c1f215e9105fe33709d522009b83942a926fd0d9a22a468. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHNC2025001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7544a881dbaae0f2abdaa44627f520b7961709fdba40e74172ecbb3052332e4b. 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/QZK6L2003895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa620d9bc42140b6d9251bf2c85821b37d305decf894cf27e5ecea4ac5ca4cc5e. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZNWT2054790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8d3c2d72ca681de77849cc053ae1ff80465fae8d80bf32822b44f165a35802. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZNWU2074882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30259a66fa806ca85ae7c7a580a585ab55cd7519662727b5418d674921d034b2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA62100555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7bf6f977a6255116766b7b33a4c5a85aeb9770f6f9d5f43e5efaf2bb6a750d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLRD52022936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cef88c1172754f67c4061fe6ef1545f3a8096bee96ac69fd25ac6d34943abe5. 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/LKA0S2100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c677dedccbf525fdd91048622b00e209364dc66289bde77e253980fc443c536. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/LKA0S2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3edd7a3e9d0c6830aba05590e1ae8a6104addae7350b1da746afb2ba1cefb3. 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/LKA0S2100242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cf24f653f4b0eb865902a602f9908f81fadc8282015da0d2521a2861f7cbca. 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/QZHN42260340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5030c0855e5d7c1cea0a06acd0bd96214b8202a3b20ef47beb1e76c9ef4461. 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/QZNWQ2232086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71069513db6cce51fd88b46dbac3a5e30a614f9d1eba9dbed443b99c38033ea. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNWU2236583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a040abc34498e5a6ab6931522944ef8849f9bbf176148389ab38614131731b. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZFZ22321107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef80fd2f1ae72031728f0d07f8728799703d8cd9e335a87a3ab57aa8c23dff96. 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/QZMEM2307066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a7cb6dace09d3677f455289fb837b7a735dfc5b3c7afcdce8c67237129abc6. 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/QZK6P2402500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bc9d48228a781a6faec731cb63477515796836dd5d418424d0abab20578ff6. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZTLA2502267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4d13f46cc96fdcd5b4a3b3c6f92f84880b8926a2fc27bc1e2c8ea307bfccd1. 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/QZTLA2528289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511a9f6fc66846f3574ac4830a073adcb1d65bdbd1aabcb4b103ef08d790bd2c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6M2594032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc0b1dd38d14945c40952b57a3369109538c0aef17f010a51ca3af0aa440aeb. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZTB62511560.