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 0xb593b2c0812eaeab877baac4ff13c2d7d490f27b22c35e48ce07bfde4db9c37c. 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/bcf91658-ff4e-4a20-83f9-77e084b970a9.json and https://artists.proofprofile.net/proofs/artist/bcf91658-ff4e-4a20-83f9-77e084b970a9.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 0x927fae767cf41fda7802bf30a5b24eff0ae93e3dc06b31985c53a55cffe465b4. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZS652305600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda30f12ef05cc30cdee7aa71b39acf5498489857dbdced92cf6db56a6cddc3ba. 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/QZMHK2327022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e877668857082bb09495e005f66dfb8dd980906ac2e5e4a3b92ed5d0ce5def. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZMHN2372321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e3e35588fee2d7b06c6cda7a629ca340b5d2fcefc7c2c65f1edc14dd3f2e85. 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/QZMHK2372516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb792b569b545c92bec5c6534e180c03fc6cda15696d0a3d11165ec7edcef722. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/QZS632362839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec1d784df6ba82f85a69f4867315b9ecd269313cd9f9a074c6aee6bd6967ff4. 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/QZMHL2298472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd885e5c40c619394f2d75db70720589eac6ce5030042b45e7156afa8ee77e6e8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:35:00Z), 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/QZS672430440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd647ad6c31e1cdee49bfc0b4ade72c0506b131f2e49206e695963a310e854194. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZMHP2466708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e324a4188563661469e97b9f80d9bd1a14abc582babeacfab304e0d2f38ae3. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZS652443661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e3684b0713b4ea3205ed6bbf034ca8a6700bed8f80cf5880c454c78b3b63c5. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/QZS642492125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc59b9811e0bc611c7a39cf65210e2e06182f1db5f1dc04d8819499c44831ba. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM42K2490071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74af1631e09f0ffc86412dc9a69415aa45f893bc4ddccc1bba16d0ef128c7d2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CAQOI2513600.