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 0xf9fa692db11c57796f71e33b4175cef5f84e11e5ce74d250d7f4747814a9457e. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aadf6520-de98-4417-aa63-7721e3f5e94f.json and https://artists.proofprofile.net/proofs/artist/aadf6520-de98-4417-aa63-7721e3f5e94f.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 0x4ec4bb3d5a2e2ff457f50d6ee8bab611a90cd6546a631bba05e49bd0a24004e7. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZGLS2497343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b120add2acbc5787014ba88f37e2901b6976d41e3b9c0a128c4b44e39536aa. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZNJX2469539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe129afc3d0c497ff6e74b46bfa8c2d85e7c4adc04508dee41d8ba6fe83fe0e8c. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZNJX2467693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb5018ad5526ad3184f4af10a6fc5d80e557be60c94f7802b153d68dfcbfb13. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZTPX2400424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eade0f924cc5cfbfe6b1006fe462176bd524cff5b3bc4ab7d87649edac39714. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTPX2400423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfacc7bf2b5e2ddfa554ab13293d09d3828279b0aaeebbcdc48e823f83900e8. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZTPX2440135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dad741d3de173de3e8de59ce24e53f1a17febc91d9b667d3546b68d631925c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTPX2432244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edada8ae43e82b970a62c8c3e3182dea3028c059b438359eb3e4a5c7e7b814f. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZTPX2435722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e029f8848a7476e123ac24beadfa5f9bc800e857ecd31380705ba328eb3f95a. 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/QZTPX2434040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce15495e2ae59f5d615b312cfc64aae86ab6931ef947d1fb7af804a1b3c5dd5. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTVM2457992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296abdd3bbb293e9f8c649ec9abec9bd63ee783ff3ab6105ff3794b8e7dbbe3f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZW9L2444109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9b73c9a473999793024c176bf3df29b556c4ead473bf85c565391a3b920465. 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/QZW9L2478516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313a93bf68a19589068da85fbb4b5d0b6e3ad2f5a6a6990af4f9393b2cefa906. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZW9L2487639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e74d564a687fc386e310afea9e1e62d96efae911f5fd6f5bccea78f5cad974. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US7VG2555862.