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 0xd212c70288e4cf08a03f960c2a6b8bcde54dec7824c2f7c813319a2b128c947b. 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/f72497c5-03d5-4a4f-9bf2-a15fe9953792.json and https://artists.proofprofile.net/proofs/artist/f72497c5-03d5-4a4f-9bf2-a15fe9953792.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 0xd89a7924837181239c3c090bc3d83bd622ce97fde345d7db995a965c655c97d3. 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/ZAE751500593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8b8c4069948da5c120779df44a0d551f6b99a31e6f4c8f3e0da67dca3434b5. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/ZAE751500595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53bfbbbdb4098df9585f6d82dac3b72e2f7a95bdd3c7b236ae32f708de326b1. 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/ZAE751500598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7378d029d2eb5876312f099dd6b6229ee3264f9cb7c27c65f9ac11adbaa05be2. 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/ZAE751500561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b440f35aa1dfd6d8e53cd249d489f6d7a2e613a2d76ed2319f9d723b6f13d7. 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/ZAE751500562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fd08f990f27546757c8e06d4ce2823c9750ad6f677f66aacefc2fedfd6bd3e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ZAAI31600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625136afd94ca5943aa1dc11bc617bf4635bcdad9c61b701892aaa6af6141824. 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/ZAAI31600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b2bf2423c9ee5c5c8a3524887e9cc1dc4c705048a71c37afce8cf6281cb4ee. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/ZAAI31600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce168be0c098e567cac21f4c1b054ceb38659f6a7cc5662d6f507fbfcd419fc6. 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/ZAAI31600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3c20ebfafbf673b64a46611a99859f00c33e0fa6bb29f316083c6424472ec3. 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/ZAIA31700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4374d5876ef2b83036823e5209e147d842f8386581703d72262436ee0be3ad93. 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/ZAIA31700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ae00f578173cb8475ac85f684063b3f7d5c374518595362766c548d6fd5c35. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/ZAIA31700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7c47a395251179641dfabea97809d946dae3be1dfbf0ce404a604aae1688a2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ZAIA31700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba3cc1006f57eafef5ec14e074da81dc2f4301a2bc58e4a238fe9d2991274ab. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/ZAIA31700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6ba394481afa55c5bb8f3816bd9671fef709b41e67d150234e3cfdb452f4a4. 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/ZAIA31700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01b5266adc3f83be21a0afa6fc53bcc9175ef68a93d0b896a6500c2233bfe51. 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/QZTB52213719.