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 0x0b9367cc17514aacf89269661e83148fdd6809996b96170d844fde481b59245c. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5391d595-781d-4fc7-95a4-775e9cc0b206.json and https://artists.proofprofile.net/proofs/artist/5391d595-781d-4fc7-95a4-775e9cc0b206.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 0x3a793bf486eb4affeaa2f8d844b3e71d3df4afda5ee380bd7c0670aab96a4e6a. 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/QZWFG2400224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b925a179e530aca0e1e5bed6de55545e1c33a9bc64cbf15d8298dedf330de7b. 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/QZWFG2400225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a99d6e93eeb09617a37050f19620bd17306ea26db76b5a504974f0cf73d7170. 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/QZWFG2400226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84e9ecc1b2b907894514193574faff6a427563b11fec5e31ac1e7f38c8981ce. 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/QZWFG2400227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c307cb2f3644cc329fd86c6399f657ceb041bde5afc72c482dd88d7a467ff78. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZWFF2462170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f429592499c880183212066f20890eed55f28e2a4f6c3202a76ece59b482803. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZWFF2462171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73130653a26757eec95070724600736ccf814f7eede12d63162c620cae14d1fe. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZWFF2462172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255b3d543d1d3b437a802df5f8145b6675ec9fe101002eb465235bef93957075. 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/QZWFF2462173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f817c7ee04bd9dd426e5c6be301ec965858c93cf4fc22b69a51252c3d0391d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZMEP2556643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12b8247d703a7c060b3f3193f6387f5618565249cee7bb4e561f2bc05d0ac12. 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/QZMEP2556644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c33bdd68b045495270150136afde2208502921df1fee5b4c5e0220c4f7baca9. 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/QZMEP2556645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e22bbdf9ecba53d48d6c45c547083a4c33320bef6ea1699e1a6431cd744fad. 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/QZMEP2556647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb49064aaf895ad4f6635f5b2bc2a52387d5f4122aba039afbace30ccb2a9ca5. 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/QZTAW2537728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01d3b0dd35aa8723d4ccd1921f8201633d1888cf101cfdc9f6faf51e41c070a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAW2537729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d9f75568254beac95bbf93c08db409b358d98aef5f0fea0808420d58ab6512. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAW2537730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26409ac56a15f24b836099c94af91b28b6aa08f96a435f1199f2ab329b7c948f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTAW2537731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f31fa3f71f22102631f29fe62e9bd7576b543f51fea1b4805083c2ad9bea4dc. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZTAW2537732.