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 0xca58f929753b6b723fcbff6a344a5ef388867b64dc4efbb88aa85115e05dd413. 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/ca05b5a4-b355-48f5-9d56-1d30e249783e.json and https://artists.proofprofile.net/proofs/artist/ca05b5a4-b355-48f5-9d56-1d30e249783e.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 0xe7fe5f2ebb6c139dd0907bc8a4fee8bc0a182fcc7d8782cfef98461a283e6a82. 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/QZMZ92075415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7d58fc5d6eb6c00bce996f30fa6693ec337752affd498321438e1d6d5a81a5. 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/BCQME2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab4f875920004e93b31a68e1d3774c4b33376768370d6e185b75f0db5e986ba. 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/BR4GA2400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe93b27ec6b6af9697d6adb69a7916a8918b287b4b201d134dc20d8685254e33. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BR4GA2400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cff9cd7077fab984aa3e3daed9b9a08fddb45f97b8a9df862c88f284974aa50. 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/BR4GA2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c34ebe73b19217141a3c1592b95e1c0bf5053517e0001a5aba57c31c8a519e3. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BR4GA2400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab4f875920004e93b31a68e1d3774c4b33376768370d6e185b75f0db5e986ba. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BR4GA2400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe93b27ec6b6af9697d6adb69a7916a8918b287b4b201d134dc20d8685254e33. 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/BR4GA2400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0cd3ab4db0a8800c5889df7bf64546e2066b431f0d3f05538465a7ba72b5d2. 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/BR4GA2500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bea90f76edaf9fa2ac125674a395bc075a6176fa02d2f12389c5cd3e55d286. 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/BR4GA2500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61344c84f3f8720318a31ae981d520d818f3f051fb2791b808f512fa83cd793. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BR4GA2500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5100098b952e050fc90c3a838b75c0a8d7a7dc35099de06e8a18d330690851d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BR4GA2500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a1fbaa43d29aa9495fb79396de2f3f786f22000813deb29a77b4b9473a201c. 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/BR4GA2500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbef070beb175becfab11d64e5536f75e857bb8eef2a68b95588e2107cf664ac. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/BR4GA2500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ebb4d6829dbd33b0c4a2a82b35e0d76c5e6097082b9510788b461807f718dd. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/BR4GA2500056.