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 0xb99874b0bf7c7cff44902896df984c0264051b7bb6969166ee4846825bebce2c. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d498690-3d1a-4d1d-8722-ec8f5aedeb56.json and https://artists.proofprofile.net/proofs/artist/1d498690-3d1a-4d1d-8722-ec8f5aedeb56.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 0xebe6b32790ba70f1916dc2b9a8b562966c8d8b7533ee2e4ab7e50fe22749ff55. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZWFR2465415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077f31c82387a2da67c8b0d0c98c682ad46b51bc4f867f55969662667822bcd1. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZWFR2465416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d0771ce2e6ebf0323be19c0462813816b3c80a808508a39ad49ed99a7956d3. 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/QZWFR2465417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca4086f30b4d5c4e64156fda1a4779f894ba32e8ba4ff1e7e9ff5a3d6077e2d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAIW2436121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1ca69e52e95b18bfaf48694d364114289e1984d9441bbe5bc37df41b6deade. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFR2465418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7ffd85bc3a47126e0a39dd2d42d21fa05af5775a11274b01bdeecb24de68e0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFH2312038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc43cae59a63a2387b90d0c495be654b422e783f39eaa0da8aa5135751ce351. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAIW2448237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ce26819cacfa1968a8906dbda124d0aff8a62458a8c31eed68322d84ced117. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZWFR2465419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f6ac4b81f8f7d2824c56aed58cfd831991ff0ab932ce44bde93ece5512c8c4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZWFQ2424039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690b41b491900b58b5d2898907e1d6e7faea1a234178429169b45c8e68e66a55. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWFR2465421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b633b2d01bd7f6aa072a1105521605efb0364fd0ceca79a87c38f077d09558. 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/QZWFR2465422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646799ae38c09aa001a90648b87d02815a178ebe5ae9b9a93ccbc8ec7ca3d2c8. 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/QZTB32331302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef0092a4260a434286302e33e5a00f4674621cad1aae1ec1e26c9d84f84a7ce. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZWFR2465423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcfc8dc58f847c7af7871c0b6c70bae0285d9fae0a1356641a885d792a70c05. 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/QZWFR2465424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f947aa1f276be9420aefc4b330aebd04b78ffd9485088339b0e29b5e0e83b7. 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/TCAIW2436354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3333b589d93ab90d301a1fd6e92535a5595557e33c6dd09bf2720c5cae1c434e. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZNWT2550317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832309a68f5940f911d8a7451ed3d390b2699dc8c011d857ac237a0fdb76db7b. 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/QZNWU2577647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fb94a845226402485618bd7a7e7db94951354fecab69d2f5699fc339efb25e. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNWV2519367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b7fd93e192fafc5faf1b3afe5b15a7c2b085b6849606af72ed9a86912db136. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTBF2543268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91fd6ef5b7c772be96d6402b8b2627a9efa928675ec6da3b093bf57052e9439. 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/QZRP42559006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb487ad6bf9337a4e673c05e69a7b70a3579157423340c30f0cb872acd95c3571. 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/QZTAS2503455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30918eec78db5e4a5aa84d6f05b7412c7a2ec34004ebb0dbc0bdf9a2c288bcc2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAT2524767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9650ca78ed07b064ba973f7847417711230b2b8d027328f003f06f5f4588d13. 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/QZTAU2529191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa17591d6e117a7b3f79091fb41c83780bb61a9857ba9d67b099b9ccb6e62e4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTAX2552660.