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 0x173034c31628e28c8a329dd3ff7be1bf300fca31b151db511b5dc4c050110312. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/840de273-63eb-44c5-ad2e-c3f6322b7cee.json and https://artists.proofprofile.net/proofs/artist/840de273-63eb-44c5-ad2e-c3f6322b7cee.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 0x223c514605c5afb629702d1ef0fff7602e9720ad2234ae9f80b3ad8d67aa665d. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QMEU31915305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa8fca9d511e2d61bdb5c00feb6d77dbcffd3cb418983eed83258f65f70ebc9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QMEU31915306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420e7e8a17428f51943171befe8a571a20e3162ba9fedb439f70eeb253ca1a43. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMEU31915307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2e085b6eb5fe873c4145cb5b1e7fe4dd17bb1fb81d68132c714549cc3c445a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMEU31915308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dde241ed286ea9970a98cac0c403d925f8f73d906097ddd7afe7a8569119b2d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMEU31915309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92482b86b157e62ff23a828d5ca7a55da3a9cf9b877efbece59074d721f8321. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QMEU31915310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa278028edece93cf1ce44ff58ebd93ba14eee1cd0d3b4e2ad3349ef565982a3. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QMEU31915311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa166f12ea4c3d6995b5806300de3596520dd784a5717a7bb7ffb9e57ebff5f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU31915312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4da931d7f229f22795dae9da585209cc1daae44f5dfa021cbf4dcdad3642d2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMEU31915313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7ad9433d3e3e6c610e2a5f8c46389850dd8668b08971053a54a8d6955a0bb7. 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/QMEU31915314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6933043281c4701b82561d543a64ac3e2e6d7f4377991592008c0e747329f18. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QMEU31915315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e40486d1bf18d387eb06f489700072c3d7395f2300c2cf6fca265ae01bce27. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFZ41922642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1338c345efca7a31bb505d4a06c9a02df4e365fd85970ab5ad8ca5da3d5eebe. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZFZ41922643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e530c5373a062b9330d2c8cbebf0b8d848b8cbe9148dec23caef904cc9e1f92. 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/QZFZ41922644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc643167bc3aaea84b15292bd992406afeb4bb1311291615f45255e3d9dbbf6c4. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZFZ41922645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d35fc9e6a545b6a02d5a7f15d56b6b186b6d3362dc95beb422b4f45e440312. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ41922646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bf62615671c83154f08128ec96f264f0ee05b2fbf08ba1b127de2ed0a5dac8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ41922647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5299d2e83f875f5290ddf7a21dadb20f6d69fd3f8dd480bc8ffa2f8089476659. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZFZ41922648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee66af93fce6b4c34736114eca5ff2e5ea4440ab825f13d33b03b4745aa6c7f0. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZFZ41922649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cea5bac4c3ad2a88c67fcd647bb565a9210477367f9bf3714d392b7c25f8267. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZFZ41922650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa775aa309b78e9be4b84ca7e905a3b290311422776dc0513fc8249426dff0edd. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZFZ41922651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b517ce07ffa1fdf6df3b92fa1ca18a3e5babaf497ce038bfa824c6b1342b90. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZFZ41922652.