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 0xacff9578ca2e40f4e0b04c742d6a9ddbbe55967de2dac14e05323e97defbb158. 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/ef3701f3-c385-4c46-aa71-2a0295743aff.json and https://artists.proofprofile.net/proofs/artist/ef3701f3-c385-4c46-aa71-2a0295743aff.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 0x8e743a261983eb8b27ef57520b7430201b7cdfae610415d372136264740f02ed. 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/USHM81965019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52141b5595dc947b688904ef7047310e6b7cff61c3d65a619b601098ebf117a. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USHM81965020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824869327440717471acf3d1314d2d45b31dfa1305983eafe417b4bfa2afd2a5. 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/USHM81965021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b845e917633521c52846364065d6a349feab16be4363c39dece2b9f4713690. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USHM81965022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f65b291561b6b7a4118dfe5bfc44a5b7c1aa7ceab613f6537626f64d5a5e01. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/USHM81965023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103f51fcd3fc996daaf4804091e6848aa4725782f0e1c52effb13e8c9e2d628f. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/USHM81965024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a692e4083638c4a2bdcd0f59d0aefccac63bfebcb76d8754a4af98a2194d644. 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/SE6HN2114540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246cc792f66fb4469d1aad3e8d19b03d8a0164ec95743bd0a6c8e82b99b2246b. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/SE6SA2149577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4327c6e70a5e6f8cb0952dadeac3832a1088ab79e0635b3e73ab1515b97fd756. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE5752253485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6427bf246ce22c1d606ad76dde1b72abd54e817c96eab25d955ad6254b61f4. 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/QMBZ92277873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf377a80b11a9574e9bde5fc31840b3d28c9cf444e6562c69692e91bf981496fd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMDA62249998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea8a9e84139dd1372a7642d06265f793cdca31beb92921808f250793ce81624. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USHM81965016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444a3967cb6bfe519b5d6c325d89acecda4ca75df572ae83c61cc9b28fd876a0. 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/SE5BU2149616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fe1665aaef9dba3a6eda70a67428b34360a384969a01882fc428067d5bd7eb. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/QM6P42345178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9402f6ffc1ca0798d24ef00beb3caa6928c7e9f801b6e9c2767bb0c614c02c4. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QMDA62327039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a417c97e6e1137073a8e2c7c3d637202a6b9c89dd625e2e719ef087478391cf. 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/QM4TX2483994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6427bf246ce22c1d606ad76dde1b72abd54e817c96eab25d955ad6254b61f4. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMBZ92277873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf377a80b11a9574e9bde5fc31840b3d28c9cf444e6562c69692e91bf981496fd. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMDA62249998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08fbdb04ec18607ee1fb937e91273498ae48e58e0e2f3da568247572ec2c484. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/SE6A92124865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36a2cc7427b97ff40c2f401ce1f9a6a5e365687b4dc9f3d4661b45ba9e5eee7. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/GBLFP2562694.