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 0xdb03663a452a5f093a0d6e743310255452e8e74f826268dc7fdd378e43e64c5d. 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/d6a77d67-0eb6-4b66-a40b-35956fd96a46.json and https://artists.proofprofile.net/proofs/artist/d6a77d67-0eb6-4b66-a40b-35956fd96a46.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 0xe9959ced504618a1111c56af024884b413130b48e8339bb6ef1ba29fc28e1f53. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/HKG732258733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeb05d2201f2c6774b28b4d089a6943a1e04420f2eec7274a911c67361734e9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/HKG731528489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbb2971e7df795592030cb1ceb3c442a6f6947ec8775c77b620fe11f5c90682. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HKG732237250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc0c3ee75a371faee48d95c28c9ab2c72f759f74e9954ec53e52ff5867372e0. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/HKG731540247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc76a27319ebdc343c2947991100824ee941df2b5758505f6076df8e65f217a6. 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/HKG731615477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35b5b09814b2087e61687bf0c94542b9836aedd854bba2b7c4ae8b92e95e409. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HKG731540176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9883b4b7372b6b90bae91e3d2375591a57e8ae8fa228c78565270aabe02839ff. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/HKG731644435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69d9adaa7546dccf455eae4a9aa66d984babb0f5dc6d5c70ad6b59ecf0daf62. 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/HKG732407389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91aa1da451441dcc5b3839518dda1531072800511bdbc28fd54228c83ddc547. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HKG732407453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda8c67e0ffb634f04ceb22cf04623cd8b49387cd91cba2b9ec31ce38a4b2b8a. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/HKG732543157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7b7d3baf19a7474bd7d840636756933238955ad9bf98224f9440f08e59fa91. 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/QT3T42421787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8ecbad14c47eb4c597f86c4d24082d35a73077f2cf5ef740448df79875b12c. 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/HKG732568965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080ce2df38eb28e4d95ec0d33d184402a37c755a184fbd449d6758686a141130. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKG731401440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ab5b13ba896c1471e0833dd726200683a7fcab53362d425a5cbaec50bae618. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/HKG732568970.