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 0x09045b030a0abe7d9bb8ae48beaab5981fcb517f18db44d69be8d9f492ca7c90. 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/54971e81-faa7-4c73-b0f2-f589a2fe93ad.json and https://artists.proofprofile.net/proofs/artist/54971e81-faa7-4c73-b0f2-f589a2fe93ad.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 0xffee701732f8d1383e0e1f89b429e46f585f098ff240592f5a792f333e6fd759. 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/QZES82224792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878d576f27bf43e3add91ce8ff65521270c51d74bcd4200c2b82840dab82b9d2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZFYZ2370347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82f765a938377585e3bb28304ed9fb53887921538895a9568ab43e0ea350d7d. 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/QZFYZ2370348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f18dc2f84007ae41f82b94613e552a005903c14aacd5df70e6fde348e1c012. 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/QZHN92223848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b895751256a0e7a24a3a9af92b8bfd7a8892bcca9d97bdb24949b50614e024f. 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/QZFYZ2370349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb833d6c368a57feca6332928f89a31b079ec87e88751f6a7f2eb6c9bd31ccf. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZFYZ2370350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffee701732f8d1383e0e1f89b429e46f585f098ff240592f5a792f333e6fd759. 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/QZES82224792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c6ba9141e8b165bfd0c0cd6cf7f59ce37e0fceac90563d69a808429991bea. 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/QZFYZ2370351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb778f81d38ddb6be714af1c9fe3d5e5eb12b51b961ba146a9e9b055f3dd71b05. 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/QZFYZ2370352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecbaaa64ece65bd374a4db373706e6eb7fb72e9d5ebe3f51e243bcfab106883. 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/QZPLS2225712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ee54fdfb535252d8ce79b6241a3d238c14e4fc5d4c8ec2f415ea227c264e95. 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/QZTAW2276699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604a9a0ef1040d160e03dd551e93d0b2f828711baaeccba7d1657148b76be0dd. 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/QZMEQ2231196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffb1931939b41bab1c05c630094fb9a2462b513a012aebf6e3b70b75d5770ff. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZFYZ2370353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3d8a16347e833c38c8ca93a58ce1a561e5f21a30458bc362d6470ef85334ed. 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/QZFYZ2370354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604a9a0ef1040d160e03dd551e93d0b2f828711baaeccba7d1657148b76be0dd. 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/QZMEQ2231196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ee54fdfb535252d8ce79b6241a3d238c14e4fc5d4c8ec2f415ea227c264e95. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZTAW2276699.