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 0x63cbe485919df17f41e23e567e2d809b147d61f8459fc244fdfd914748f7b0c6. 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/e7818e82-1a1f-4236-b2e8-8801ddd317cd.json and https://artists.proofprofile.net/proofs/artist/e7818e82-1a1f-4236-b2e8-8801ddd317cd.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 0x33181001414ad301489a7ee12b6d38e852d59128c774ddb0845bad255b61a3c3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWY2020390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9a564b40d090d72e77001a333ad60e8ded270ec2117d58659fa93b5f727c54. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZES82149285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17df255043911f17e0554172354981be4e34ce247ea7abbc06fec4659fc34ae7. 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/QZFZ52163590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9a564b40d090d72e77001a333ad60e8ded270ec2117d58659fa93b5f727c54. 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/QZES82149285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd607b2901d0f57e9c993965bdd42dc5905da25bc6f2811b77cbf207975dd925d. 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/QZHN82183382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0996155cc763d5d481e11193905644dfdf16bbe45fe642c88c6d6ca7dec941. 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/GBWUL2171351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efb9d2a68eacd7c23a272e99e62fa6aafc80e7a55d14438be0ab670a587199a. 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/BKDRR2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8eaf69a770857ec97b3536baf3686d72e17a6b25f6d4240fe3efab895ac8b4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5FN2363966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd010a56347a9b5d07fbd34a8007a9087a9a56bfaee7c7fe80cf615ba5c849ce6. 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/QZ5FN2363968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438602ec2ec6f16200f95441327aa53cacd99fffbd0de5554226c412c323bd1f. 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/QZ5FN2363969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ac91213800fd771c850579f92764648bf81ad3378ac3af90e1d16a3e88bd1d. 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/QZ5FN2363970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bae2468acc48565b4c36218e44f3e96df5de404298ce978c2f8502dd90e094. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5FN2367839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac293a5ae444f2378b960955f3f975aeb4c54ffc156f248e86de3eb122012c3. 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/QZTRX2356290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ec8dd78c6690a7d0b377cf677896079729f5b17d33ea114052e4edf1ce4e80. 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/QZWDE2425545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7549c42111464ed68faeb62f37de405955052dc06cf9978801bb5b052bec056c. 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/QZWDD2426905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ec8dd78c6690a7d0b377cf677896079729f5b17d33ea114052e4edf1ce4e80. 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/QZWDE2425545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac0b83f84a46f43f9ef1669ea361967732dd2fe81297a2b6d73bd6c25c0aa33. 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/QZMZ92434116.