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 0x6f9252e8d91871ee1a6ea2aea88d15281ab774eb8ffc948ab81080187ce524ea. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51bb28d2-57ab-4edf-b542-41ff3996c550.json and https://artists.proofprofile.net/proofs/artist/51bb28d2-57ab-4edf-b542-41ff3996c550.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 0xcec10df3489a468663f3b7b882c50352ef2b69ebcb2117896ef019b7f9eb59ad. 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/DKUM72100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb26b289867d31f3b3792f32eb20ddc02d4f72598143262e4d998eecabe59f8. 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/DKUM72100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54f5f29cea6088fb11a8749d0e6d48e208c1f3af0ae6e2fe0e4e44258399f61. 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/DKUM72000215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a974fd2a0713f242d6ff23f6d56f54db2136435d3bcb624df15b2b127a525b1. 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/DKY462000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2d49b9e3845ba539f65c94d6d02de0f86b79684d010a7fe36aadf9a723b3d2. 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/DKUM72000802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55fc8e362b910aa3de3f0ed05f4ff2d45099624060fbcb7fbebe4f80b49dcde. 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/DKUM72000131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76094bb70310b7a20fa2da814f160ea2a4a1c81c9b7c5aeff331630ed46f23e3. 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/DKUM72000582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc146ddcf7e79de731c5a314a50ed862065a3bd3285078569d80652ad417e9b94. 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/QM8RL1400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa133f8f243898415e734ac966b52f354ada50bafe7f10f9818318efffa5613ff. 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/QM8RL1400215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6698d4234566a39d2682a53c82a928fb4bbebbe199f4a613f6f65243d5753b8d. 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/DKUM71600278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b708ffe1d11b83e0145089e5ebd19faa46e28238a2d71a98dd32027eaacdcf. 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/DKUM71600217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e717980622e587bb741a36bf85410cd56fc7cfe8ccfdfda2f9435f99cfa0b2c. 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/DKUM71700272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8537a4f3155bc0d3d103c6b4b53ca65b5e9e83830d09a28245aa2b2b9d4d457e. 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/DKUM71700273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d56d91c669e160f61d7090121ae23af68f84014ca0e21987e0ddb4d639173a. 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/DKUM71700274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba7979526b410adb9f177b0552418b387fa5c57892c54e0d0f465720c818d34. 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/USA2P2228036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5961b5d13d95183185fec7c02115b81ca2595e03b43827965436ddd03efdf232. 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/DKBR22501201.