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 0xd304fbcf5139fe9a4274b8aced7f81d018c1c6ef84758fd8d994230bec4c8e42. 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/65710628-b96a-411e-9afa-3e277a4b46ae.json and https://artists.proofprofile.net/proofs/artist/65710628-b96a-411e-9afa-3e277a4b46ae.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 0xa156ca1297cdd31e54bdda2d6887c6c7a26aad21afc4e434ae068b8e425a2f8e. 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/NLB601500260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be9792a9ca06f0cc4f630caf55a42ced44b0692e4f2db8918b62999a8972cea. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/NLB601500288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fba18d716c5d119eb8967baed39424e4e7570de0fe23821b9ce07a21be9c00. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/NLX590700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fb7f18854627fa7fe051f20656e8646d9a9bf29e720c47bee12413d85a57eb. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/NLX590700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2300ca52caafda03364c31163b031474213daa491ccfa799f929c1c2cc5cb592. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLG940800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4aacfb61f14be40730197585523417fc00a8134b1da8d9fa9e33bcc3de95f57. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/NLB601000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118bd71d9dd146eb8de2f872ade96a5e54dd1b000d7addc92022c6d64b577b93. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NLB601000229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c5fc87d57a9d74e44a7257983df20948cfe52b042c7c710f401bf06dc7ca63. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/NLB601000234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca3fa8bcce4e89104a834486e54349bf4520d0fdd604eb645374648e0dad3f4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/NLB601000236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33983e45a2dceefa4e0205212fc5a13091eb42116e07400da0932023d9083a99. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NLB601500198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911cad6daf25af6e0b7887f582ee43062bf799b9163af1769c2bde57b8268ae5. 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/NLB601500199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0b784860860201d60f7f2b0f918262b71e1b00e78ff1e6462cf489ebef1f30. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NLB601700182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f88f7ea99d86e17d19fbe0088695c99269c3bac4124bbcb10c5656922cea682. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLB601700184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c73bafe46ff84a54e31e21f205867ba247ca2811d93b3e834bd475e1b0eb99. 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/NLB601700194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7499e07c0c94d327cdc303f6abbad3917e2ee3e131afc04395d8982982fbdff. 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/NLB601700195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a456f4e1552734bfb6b658a0f4887c411ae685db3cc11812b5246205c38146. 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/NLB601900316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149b958e71b1862ccea583e0487b4ba3951865d7afa909ca8a812fd0bf243527. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLB601900319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540ad292b47b4a2331fd34e25c64348061c3dd563087e4300ebd35e9f3adbf20. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/NLB601900326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd698f92636be9f41456e4b07e7ff74934cd6e6f5db64fd76fa522aa994deb9. 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/NLB602100391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b29d88ead65c99ae82a3023c6789b8fdffbacab063bc71b8a8ca0d147920e0f. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/NLB602100395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6c7a91c192e3475494bd51b5ff1a1face9107e0f7e5e44281f1404d8cce577. 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/NLB602100398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eed1c66e3e0893628b86ba3c18e187e73099146f41e7bb33d290709574bf35. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLG661100258.