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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 0xd16083647a5731a71088c30ebaf0f810b82154a8f75aefab26079301a271d38d. 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/07bb9a42-9339-47ce-b83f-32ced7b4f809.json and https://artists.proofprofile.net/proofs/artist/07bb9a42-9339-47ce-b83f-32ced7b4f809.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 0x4cdcb448c33c4c0a973cc3bd0f2335e174c4ee0afe3aa500deebe4200020bb16. 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/DELJ81514259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769c2f80e8a03b0e017f1af8adf270e09f78b8cc8d8767eeb1f91d6a6f875ae2. 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/DELJ81520455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65209f711e55e51628ca4b9a30dbe364037cf922c36c7470e820fd40f5e8458d. 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/DELJ81520456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048a336107ef3f4ca1ea3694e3074d17198a3caf6197d309a017cfcca4ff61c5. 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/DELJ81520458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf5b0875ab7d5f734745406b8336d3e785ea2dac71ea8feaa2bf7fb98c277f6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DELJ81621872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dff0deeccab6396905f34d4a37bd47a389df9d803a3cc1cb9ef6365cda76ed4. 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/DELJ81621873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582a4074dd00fb332c711549cf5b9feb76cb8cc18c254aa4c66a61b5bb1070f9. 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/DELJ81621875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c2519b366b94f108bdf1549623d017f93229027c8e3578c7577a2290ad09ae. 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/DELJ81621876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30d0a993a598aade1b0b22a18e6a1ebcb65a68b24658f6e5fdace74c595bc4a. 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/FR2X41597330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccea2d41e01e412169a3c3a176c05cca58aa260fd2ab40d69fa9d7baa5afbde. 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/FR2X41597332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fe9d4a4e88f5f6c509c883c7119f378df4173e22e3248be399888e3cb5fa25. 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/FR2X41597333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a634b5f6f5d414a3819feb8b8dd80bdaaacb9eda0fb630f0e6f0e4d93a7f572. 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/FR2X41597334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9c2fe6eabb01401486a5960cf46ce86a56608e6cce0482971f0943f8dad8d0. 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/FR2X41597337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccc1e83ac4fed34e4e682bab855a0c5601eb4c253c431744e9a15accaadbd40. 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/FR2X41597340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e936e40a3c7af525833a6dbac58d87096de2775d3c0eab081b1d59dd60b88. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/FR2X41597341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cfcc28e46b5c0d06366273bec41435c3ad889d71328e53b76aa9b56304bb51. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DELJ81803756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3cdcf95e150d0c63fc8774a323f18e851bdbc4ca828ac318138446df8294ed. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/DELJ81806214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f3259bc2767fd7aaf47622b81b2a49c7079389c15c7ad2e8288ed3a7644e7a. 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/DELJ81814743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc09847ec616073fce33e87dcd0f717270772d1c7e01d4fab46c947cfcc2989. 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/DEZC62049530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e6ba23b71d58829e611413a0b98290e777e9b81d557827fc88b7e1d55c8aa5. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEZC62327634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b9cfcd64c14304311775b394050a0686f31b31e6c98514d5418de2db1796ba. 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/DEZC62372283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c25383bf77e67c2183e53ec5ac725542c3c8990b7f76cb2cf28480bec0ee02. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DELJ81806483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ddaf46447186245813f553cefa858de12f2f914413885b660286df8db78ad2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEWX12200016.