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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 0x450a504063dd5dc2ca82a6f7ed9b27ca3faeead440e8e875a05d41e721e3af3e. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25638f73-69da-423a-b8dd-10a328030956.json and https://artists.proofprofile.net/proofs/artist/25638f73-69da-423a-b8dd-10a328030956.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 0x80f7cd222fe0b81a9325ff1c686d10aa57309edfb0733fefb4483e5f9dff7347. 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/GBKQU2417466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f46eb43c9e970cb97b05f1ca5a3b499d03243c51fe564ecf025e7b760917090. 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/GBKQU2433218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a428c25f879fc079ee2102ef58560f1818f205bed5c084f968154c8ba5876a5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZWV32408575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f26510ff9fac80307480f6906a861cc05f55462eb8af0cb0b889fd15de7059d. 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/QZZ8A2418233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d90113417d21c3b5d7414c99464fd6ed6c5d802503b4477886f2dd6ca7ff8a. 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/QZZ8A2418234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e194abb6dd6c39fd11e326eddd9f82dd42a8fa6b1f1516bd4426719048ce59. 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/GBLV62403750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd5dd59de4010fa38a12a0f77dcf499df8175241a7a81ca0e918b32a01459b3. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZZ8B2425474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9b1e489c9749059ce62ef730bc00dc5e89340d275bfbe19f387a7436575775. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZZEB2422612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f890deca5831d0999c05f5d8dd0ca8621b06750ac7ffeaa8c9178ccf5ea4eb7. 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/QZZEB2422623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d107696f453290c145664601534e79948926e5b5a253ff3f1c871af3b3d575. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZZEB2422631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a6345657abad1857cc39111bd93228b54a3aa1674414caf9bc7847820713aa. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/GB8KE2502388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce5b94a8d344fcb4e5e0427b5cb890806be5aa4c80d295530372411aead5162. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZ5FN2541882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee595226bec0739c6020574421d5a9280dec396018961b7c1da61337ecf674f3. 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/QZ5FN2541883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5148386c9b93e687ada51cfb41c9a1cdf7f930b05e7e228e149bf44bddbf65f8. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZ5FN2541884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c8b32f6d8b56aaf4c2f7c630aafac6ef5e22db4f91755728a640bf9daa3d63. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZ5FN2541885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d18a824d206a9c4e7981c110ca7a1de3ffefeeecb7969603bbc04bd2751302. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/GBKQU2512286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03acd6f4361c0ed9cc9931282db6fd2a555b623bf80e4e6cc8e379dc74a7c74e. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/GBKQU2512289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bc7cc8db4d9a9d55231f6e19343cc176786f82d2708122abcf676987d69b7b. 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/GB8KE2509228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6180f4069c2b941da9411a4fabd7c514f88b224b42594bd328e99a057efd8191. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/GBKQU2538932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d54f76f00584bc603ce43369670354c0d164212d1a127d62d676d5d98adc926. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/GBKQU2538933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0393fff66154e39a59eef653ce03bea226a31e815524835a06367a5a742a436f. 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/GBKQU2538934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0751d8c844b358d5a9d5ca7e63440ba5ec5f1be17e35c563a3f486da561735e. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZWDD2563551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feb1d8ef831cdddd56fecc624c2230364fecde005d2c1cd288ee83df956276a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/CA5KR0042893.