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 0x244f7c0a3044a2edfde15131381bad6ea35a70a0c77199b9438fafa5bdcbdf77. 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/5de88995-bf50-476a-afbb-7c54e8f98d9c.json and https://artists.proofprofile.net/proofs/artist/5de88995-bf50-476a-afbb-7c54e8f98d9c.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 0x92492635aba418c93a299847b5f1ba361d250e249e1ae0ba4c9a0de2e2702af7. 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/NLAM42100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6248fa78ba758bd5ef6fb619e785c26beb913a355eda1daede4da72dd91ca0c1. 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/NLAM42100130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e237780ab751d4ace0623804c927c90fbc4bb19ee3fafde50835601b8a21f45. 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/NLAM42100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fa5160f72c6d88293da44c021703bc4804fbaaecef220319212b029594c60c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6M2416053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d88da047865c0a47e9d7d2539fed1f45111d109e64716422e65743e14b42cd. 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/TCAHR2306229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1c639d2c7f38dbf7528c58bc336b72bda784679be93b8eb8bfe3d981405706. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLAM42000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4034fe486219f87d1c4b4eb28eb5322ea74e2e0a68fdbb335a8d91f02241457b. 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/TCAHN2395924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2e42ff4110ba4e962c46467165ba2ce96928bd74555a5548af4854dfcdb18d. 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/NLAM42200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d33adcb017f711edaf4bbf47ccfcf9c22df3dcb8ad30dce6d205618c327ad4. 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/ITGKW2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc78b6330fe7e5017c0cfdcc55588f3459f1b3d457e6a1f86665a58c83196ae6. 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/DEZZ52170471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc806b80f1d74c5cf83643e21ec5d8175a14e5a3a8fb68da0dca7e7796ea2309a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6P2569538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c90f0aabc721f2637c946fcc6250f7b56464be9f9d2688c585c86b550c63c68. 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/ITIO32400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba7a195184cc219ffd799b940274aa4ed3cc5f5723a64f882d325b0d11a42f7. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/NL8RL2407277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621450d79086c5f4da2936839fbdbf1e1fe030d430708527ca72dd8bdd38874e. 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/QMFME2367442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404ab5f9fdc11fc85fbed5f1246bdee18563d2e7743c9f490f43700e06710aac. 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/NLAM42300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5d51c16f0aaec3f6e91c9e2f1d65d04a5ef95a4cc84371195ca6752ddba17c. 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/NLAM42200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2c0a307d5ad5cd4a26b1466a25ea3f30adb0c6aff2c89aa9500b58f061565b. 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/NLAM42200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146e979eece911a1d30e732e20460d1e708e0f5139c43d9662fba17265840e31. 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/NLAM41800118.