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 0x3dc3ced7f2e1a1c3bd1118279853956a942eca7bc33842edda47aec9d8744c7d. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e16ecfb6-bade-45f3-baf5-d0712461c831.json and https://artists.proofprofile.net/proofs/artist/e16ecfb6-bade-45f3-baf5-d0712461c831.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 0x0cce3a70b663cad82c9f7e461266bc29861ea2a7d675a7e4e8e336944e692702. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEQ022005067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd338228a16d8bbc2d922bffef5c930be56d03087dab56b6b4865410d7dad6e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEQ022005341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762cbaf295fb7b7a9f59a507205048d2f98080beff0b9a6c293f8cc533f028bc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USLZJ2159111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cf6763c288afacb257ce9aba118c14d28a7de85b9176fae49bcc4a4ea98b73. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USLZJ2159124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531803a4f2e885a7086efeb40eeec062de40d2f3e149958cedb7874a45f47a68. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USLZJ2159134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf279c5c2ca6db11f7744ccfe90db4397e779767820832f7034b5bfe9a8973d84. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/GBRKQ2431659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfd1b41504dc245a06e35d3c212fe4a1bec58e86c4880993779370b6d312900. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRX282477304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cfe8cff57057e294dc031e95821432c2b72ad059e9774159f8e133a5372aaf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX282477314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d73a5e594faa26c5792846616ae9d38d1a58b098d3d6420934aa138d98d12b7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DGA082417021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121b5632a4fbfea6a1f96299a1bee0d205698cb26cf2977bd6a8d7df549b7425. 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/DGA082417011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed1300965c2fd7c6de62cebc94b0e49a2f2413937709d22404b93ff14fefe37. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DGA082417015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecd9c7b51cba287ee00c86d7a9119748ce62e99e8a678edac4be9adb0094399. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DGA082417019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d73a5e594faa26c5792846616ae9d38d1a58b098d3d6420934aa138d98d12b7. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/DGA082417021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064a53c9020b4e6bc888e8f508f600698b6bf3aa8d2ec1beabbc0fcbf4b6e9be. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/DGA082417022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225b90f86d147d63fc48cd5b3dd313c2bb6acb77ddb14b027193a42e6fe77bc4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/FR59R2522573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906cb4b1daeff02e7b55be555f572829bf23829bca2112f1036e6ae464458d25. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR59R2522578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d58023da988b22582c5d2af960a7eb8cdde44623f8588423038fec6f8b7ffdf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEZC62146174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f525953fcfd884a96400f99e23802bc1aab0d591e60471e8b139cdfa14d4a74. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEZC62361532.