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 0x994e9f1476d08b67583e98aa129ab4ae63d7a3d27b6fb3507980c57b2309770e. 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/21aa2dd2-4206-4d3e-96e9-be8fad36241e.json and https://artists.proofprofile.net/proofs/artist/21aa2dd2-4206-4d3e-96e9-be8fad36241e.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 0x73c115aaf8244f5daa97883212c0fb6bff7e564a1a3d5c746a6a2f51d6d4f718. 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/FR59R2461958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0494b42e3250fb25c35a5d634a06ce6f6cd86ca9f649bb3c877416271d40da0. 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/QZFZ32447814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772d491ab7123eb8fdf06a913a453e87b6656fdfcaee2e2f82f0b79733f2a8d1. 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/QZFZ62427596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30c28335aa2ce2ae7d46f8d13d6c6905c7378e41d88b372a5ebf5f6f9ed1dda. 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/QZDA72410505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9b85c6b5f89058bab45832a2b94ee399adca252ca08b4ad0945d895dc78b73. 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/QZDA82413617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec9eaa02677df9b3324b5ee154e936fbf1074606c3190e6869e9ad346703fb1. 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/FR59R2460881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6681a81c9bebc8f5fbb60d5ac3e1fdcdebd8016bd92aab5b6a4707a462aa613a. 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/FR59R2490674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f31b039a8e79dfbebf66d7a3ff51bb4bf9a24125bdee867750bc8c5ee725b1. 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/FR59R2490675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b656773b7eebb8a763630aec1f4aafec0b8c88341133f8bf3e77803fd169b13. 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/FR59R2490783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1535cf6e50abf360a0ede952a0d675a2e4fdb4ba3bc15e54742d54b157a9b6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X2476304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0ff370de3013797d6332306adb272f93d039a98b93b67dc8c61b0e5a3ead95. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR96X2476305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa040e3032c8593df9da877073ba345633203da7a046aefc681ba7a4cc1f51469. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR96X2476306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90675612ce04e40ca30c853b7996264326b8d78a1efcf4ab30daa7558a29234f. 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/FRX282458802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518fb4a79b67dfc00b10945d67cee5fb3ddb9af850a8b3a939136c979351042b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DGA062495108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb07888bd58f72823de15120804ff6e6e4d523327489cc0c5b0ff7b6b30990d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DGA062495110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d258b352dead2411406ac240d48265d588a722fedcbe94675ed7db6b5024f9. 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/DGA0H2461376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fd5928e6910c56f3cd15836550a222d108b7bab996038c7caf00a16b3dbea4. 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/DGA0L2403708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ceee2843ee81e9b4ece3f9d4768b0e6138bcd3c61a4fb02f9c3352a93ad602. 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/DGA0L2403709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad2795ededaf118689d146caf3d6b27d964b8db14266f69c35f2803a09baa18. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DGA0L2403710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c45b92c02d14959f7f31a3ee8afccd7b03abc8b0408488c33cc0a10d2e66c6. 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/DGA0R2462636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869fb71081ae32fbc6e6f7646da65abd0a2cc9f4f889decf019ea7d4818f0f3c. 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/DGA0R2462637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bc9a19bb66de7f50efbb36a9beac0c1b4a77457a438035bdf80d936b15ba56. 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/DGA0R2462640.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59abe87daa58ac43c9b66f24ea698ff611f2b630c1b92253498710cde2e68646. 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/DGA0R2462641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a4f4c92429015142fb048a6b06be07e44b318812573ae6d765c3534efdae6f. 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/DGA0S2421781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3fe243d67c388725fbb11cb3b933c74a10bd48749a8885a69c0a3c52c686fa. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/DGA0S2421782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523a1e66a7b4c7661c590d0396a2a19227864f5b2acc4d31497e4ad1acf32766. 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/DGA0S2488342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb170ee6fbdf63c262a9e2a45089f65ba09754392f813828d3e64b7e35e1c4f. 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/DGA0S2488343.