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 0x5dcb7883a752eb36b0fa61c1b5c26fb6eb51bde15be1649121945691cd34bdd0. 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/ad3d6d1b-72f0-411e-a041-1af6cd6bd8d5.json and https://artists.proofprofile.net/proofs/artist/ad3d6d1b-72f0-411e-a041-1af6cd6bd8d5.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 0x4c8e754ed2ff9e2d3bc8f7db7b02123ab9a785e1a10056f756e45754b4d5f7c4. 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/USANG2225319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949732fae1334f7fe57ba9da967331215fe1cdd49667e1821bfbb655ebc0aa15. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:19:34Z), 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/FR9Z62300750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f05f72da65729b00abf0bf23d8fb72014fe43abe21b946832fd218a579c816b. 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/QMDA62475654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6dea879c259324279f68fa20277bedff0815681d899ed81ed2a4b063396d8c. 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/DEH742431233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbebaae097629d81b941e7cdfebb3f3f2a6fe73f1ed39d0ed9b07e638e61116. 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/US3DF2493659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc749e32bcedc48b8d8d61380a063a34f16bc12cc0b21b50bd0eec3a6142216be. 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/DEH742424123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3afe4ae546066b0f1a9ea62eed2d54e97edea30c705157e004b0c95200a4f33. 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/US3DF2487018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120507dc8c56ac665078f8700a76cd121fb1556012c4ef5f7d2e1b8176db3dbe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF2454769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fea47fb27dc36976170f4672369d5a664760f6070bfc2210e5749d32603de62. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEH742411649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315e93e563c02e3b32d62a3f6547007bd388583ea3ee466c4a6d7b973f201156. 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/US3DF2431520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0307015d02005a00115ce2fc09aed3d9f63e29175c6c3f5b9cf8ab9b3f1b38. 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/DEH742407073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f7591236e319fc1707e53e45e725617b247983602fe01e5f956cf4a780888c. 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/FR10S2424819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fbfc2dadd0e9ad5b902e789f156ee58ac773926cbf54ceaa3b13155dbee1b1. 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/QMANG2240435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4825745618eaa6ba12a2bf703d338db566c606d061c4469e96f593bb04865c3f. 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/QMANG2248614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1a261d02f70747169ec868d0ae2d7920b0534937648bdd1b4d5eb6d9d61140. 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/QMANG2234298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf2865f3a290f4fb9c711cc85f4dc9b86672c70d230308159515b68f8b8723b. 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/QMANG2203034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f6d344f62797a5dbe20c41144c09f85c8102caadfefb6f502d6071f40bd5d5. 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/QMFME2305057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62efbdb208afedbff0be34de9531f5d389d97e17cd2d1d7c1fb07c95bd39dba7. 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/QM3DF2225574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924938c38a4bec99a1dfba079412b925717b491c491b3186a0ec14cfe66ee631. 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/DEQ022371882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a344e9612c0f5152dbcd3625e36600516d3569a63f3856bca50c6c805c64e40. 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/USANG2251098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8216b24362c8098240ba963f1325b6e33d59d664671a76ba51e3ca0e9a2f0785. 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/USANG2271560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab46e473240c33dad0b9e270713948545109f64229602873ce3a851827e35abd. 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/USANG2252205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e3c1b111862fd62f4b6b6ab571aa0c890275024dcaa52e293a4c000e13ed3d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USANG2253342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42eacc9f29fc7dc08dd69b27626c09193248dd8bac9d44678fbe08d0412ec58b. 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/USANG2246830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fff239a57fe1cae20bc8fe36214295083bd4af901f9f6a26440e7efd7e24640. 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/USANG2244054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd675cf39a26c5970114fead5eceaa0ea10507c4e6d7b353f3579a934e72b23d. 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/USANG2240660.