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 0xe1ddc6af43023cc9667a77a9e1158b8a2000e6805823bb553cc05e776fa1a17f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c47a0ea3-37cc-4946-a464-32b88465d8fc.json and https://artists.proofprofile.net/proofs/artist/c47a0ea3-37cc-4946-a464-32b88465d8fc.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 0x6ad24758954204fe24a7ec7fa904d98f94f0661acd954defe7fc291ab6b817cd. 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/HKE022380001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2e40b23d9ce24e2c4b1e71b84f7213b5cd29a11324ab4351618a83c5511a00. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKE022380002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fe409bf57ce18c434b8ee52fa55d507ca9052b708f19f0a54c675625d60c2e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HKE022380003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edf3f5412a8e77ed99f6bedffdf81719244b630528b2c9e10994929be7bc835. 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/HKE022380004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bd01b6901b212ab139550e8dc407e530d4b395bb6d13dd3a4a2a645de37e96. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKE022380005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe12107cf5ece066f55cda3e0d36d4998f5f4592e7b8d29d548949bc6ffaf23. 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/HKE022380006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb186cb5df25e9b4439fd0dd35797ab5a2f4943a3615021ef8af8ed6f6c5a47c2. 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/HKE022380007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0b97117f1d4fce6f863af2d62131f6a64a2fbe5f7d91e4731c90086466b27e. 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/HKE022380008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9068e5b00cd0b7189e428c5d67b0698f774013b16e3852a3440330f2c7ebb7e4. 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/HKE022380009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c82c07905c7b5b6ee0fe179909b4e5f17988179c6e774a9dd22f40604d1abdb. 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/HKE022380010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7b074ecacedaca4569cad8303bf806f635efeade5f0a1b6c06bcdb7e66f76f. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/HKE022380011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269798faba8ea6c790aaa5aab2236828bfcaaa32741fe157e69370aabfd2c5ef. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKE022380012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d943fc7ecabc86900c01009fc0563e2de5d4b892b0a4385f086f66ebc0ac2bd. 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/HKE022380013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92818acc8ce67e7d594557b0e9196a738974dc3248e0c75fe20be4fd56f44857. 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/HKE022370085.