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 0x70aa14982f57f30643c1b17a4ac953a2cd0eccb4349ccfe77bbb28e64f03a0a0. 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/111d0beb-b861-4123-a8a2-4d1e778c8c89.json and https://artists.proofprofile.net/proofs/artist/111d0beb-b861-4123-a8a2-4d1e778c8c89.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 0x8312885c30e4cf33856f71faf3d4e78bedb40aaba030cf1f4b778e3b1bce9b21. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USHM81740871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65782bd307152c3cdd3b56bf41431d1e5269b6efb4d93d7296cd5e7a66f571e. 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/QM7281990593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390490c1ab2be1f56a2ddae6d5fcb9f6cc5ea6bbc156479ae53e511837274538. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM7281990594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1be021fe21d4260dfa656801c9574f6131c8f56bdd1c608b2a5777f00d25721. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM6P41939101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656773417e3166b9094f65d7639a48b59776032dd2a1de2972de57ab7e1fce52. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QM7281927024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2445a038244cb41e00921de021a595ce97745da968da720a2ed1ed36eecf49. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM7281990599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc2cb0bc4ad751ebf29703a38138646c924ebd3ebac7cbfd46ed9cfb44065d0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM7281990600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc4c967f7c60a47f78e377cbb062cd62de60a7547f9b5fe49c4258146da63ec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USSTT2200092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc4c967f7c60a47f78e377cbb062cd62de60a7547f9b5fe49c4258146da63ec. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USSTT2200092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70da98f89fe93748ac51037620cdb09cdbd6b34858c0f57a627d65902524cc67. 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/USSTT2300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a16216f225e44bffe939222acc15afe98f01469f090501c9deed2ed137e33df. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USSTT2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45104f62cef7e9524d1a5e2ba73e8b7a4a8c5393aea20e18faa90d9906ee791b. 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/USSTT2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffda388e3e744547f98784b4bdd5534ac4d10254b6ca498d6ca2aa1e7bfcb57. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/USSTT2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a16216f225e44bffe939222acc15afe98f01469f090501c9deed2ed137e33df. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USSTT2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c34cb3117e5d237d181d61fb47fe82e84515b767cdce0306c44943fa053969c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USSTT2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563b00217d6bd7f1e31c28bcce0ece1576e1ebbd83373f52474745f0910e54a7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USSTT2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf0ec2096516d4bab43dce4a32a43e47a72ff3f2e5609e257c54ed29ca7738e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USSTT2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3219e5fd88b75ba0872387fa35b2230c1aa27891e9777bec22c1a16d23e4e975. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USSTT2400021.