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 0x79581435f7e11e5ac03f48433afb94c66fb59859a0fd3a7ff48dad3287a41467. Chain 2 (Bitcoin): anchored in block 953941 (2026-06-16T11:51:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21358959-b289-49fe-8cfc-2d85cac44c5a.json and https://artists.proofprofile.net/proofs/artist/21358959-b289-49fe-8cfc-2d85cac44c5a.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 0x5dfaeb85cabc17744070cd9b30fc40c5b53ecbf14301db6e4c7e892e934e0263. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKD012203777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9304ca99dca9e685649891342b63660adc6e78e82cba96a47202437a0ba51c4f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKD012203744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649778ca67d5cf6d7719a9bb235eaf67d99324fad376ab51f10393fb42c25e97. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKD012203739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa514b22302170adaad1d5adfb01ccfedc402ea22ea3d7795fec0b054f5b4f7ca. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKD012203732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d28692d170c088ef765c0aa2af1b982710348ef6ccb20413aa4e2c4f4df2a17. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKD012203738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002a1de52efb195552788484535c20d3e4726bba7ea1ed9f8597be79e6746b1d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HKD012203742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8461b6a39febcead15888d1d846a98ae9864a294c01378e1c98d91c4d2d6b9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKD012203753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952858fa20382e5e7e605664225861e48fb18edd1a6e5bd08f9ffc37a533cfb4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKD012203735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9448d221daa27a6a2ebed569a421dfc750f36d5a73eb2653e9b8c0c03c59cc. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/HKD012203741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1041be642617e5a67c01e2c894f856f1f7927c26ca57a15cbfdfb9cfeebfe564. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKD012203764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349c4cc78b24082a790843b5f42ac06f43f6a686fcbaaf8cbec123b0741eb703. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/HKD012203752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c35031f0d734cc934d06b7a6391a6acf9eecfa3859421bba24419ba4f10534. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKD012203743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4662e67c1e63d34f793e975a25c72fb2a0cf3304c9b05cb7e0c04e52ab5836c. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/HKD012203740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd32b8b04a1b24b3647540ff2cfa7d765099f9531191e6da9a3ce7caf1a3bf7. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/HKD012203733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479f8460055b9b4c0d2adb3f94dee342f24b9907b3a3f1bc7d91c2c2b980ef75. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKD012203734.