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 0x1d156fd3ed383eb0dda80ce0625899e969ee5912f469b767a4328918ff901f90. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bdde130b-7f37-4b0e-92a8-000cd3b731c4.json and https://artists.proofprofile.net/proofs/artist/bdde130b-7f37-4b0e-92a8-000cd3b731c4.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 0x224771853f9e8ab3f96d1c56cfba18656b262db32dd8078fae548c2068a504c3. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ITO750000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cee947644744fa40993f75bd46a291f56a0db59f6c8df641de7479dc7b00247. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ITO750300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb838e00406383e656df7513558cf94020fc3b1b896cb5c1823d6917067c0c204. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/ITO750300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b57e3077ca8134cc1204901caddea130baf15a553898d8a13a4ec28dda2d286. 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/ITO750500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d79ce0a4e6a450561dfba470c51026a2f5727c9480692ba9bef131de5ecb48. 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/ITO750500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46afc14f30e45033bd222863b6ab6dabc20b1e14626a95d3e9c5ae1bb151af7. 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/ITO750500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a838bf0e47b4f6265f6b778f5b91cfb0c3800f8432b9c637c0b0d2e7615875. 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/ITO751200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94d06fd2ee7a5bb745e05970629beb46e347f2247243ba97b62c8eb2e9a76e3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ITO751600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d88614131849b0b55c26979c5be10e8937b71f0aa286405d083798a83f0381f. 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/ITO751600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187f67b28d46548f53c60845f808e34dd4882a99c1971140a29489eb5f070cdf. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ITO751600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2651bfc905e064691a5970eb1028d39986e90bfff3acbf61d3fb3be46cc406. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ITO751600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb445a0493f0f680047689a0c5c7e72c2230edb1214f41da4fa93703e2038c362. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/ITO751600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586963bc5a414e5e6babc61274cb4092824d5450f021d576f716b269d2887d79. 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/ITO751600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d8b334463bb5ca2275892f3e1eb851ff6588ed1bcf0a0c2a0f01cb391798c6. 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/ITO751600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf155542b781e4fa197f4deae727e05d67368d4a1b8fdc9d881b564a016d0a910. 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/ITL7T2300009.