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 0x41eec1fd55eadc87b2f019cb0c61d0683df75cd598a0e97e9bd6e21ebd0acf6c. 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/f1225e42-ddde-4a58-b131-9e768188559c.json and https://artists.proofprofile.net/proofs/artist/f1225e42-ddde-4a58-b131-9e768188559c.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 0xe86a634fb86820956db68be1cc96aa007dd8e9fa4ceb064a3cdf0b5aef0d8fc9. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/CLCZ21602031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d716173ea08bbf5acf171a130852f36d2e31aa6d202bf187b80b0ab4326625. 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/QZ22B1740089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909230fbe2a423d8d07f51a59c7aa99ec0c6024ddd120addd67e1e38c210052d. Chain 2 (Bitcoin): anchored in block 957634 (2026-07-12T00:26:43Z), 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/QZ22B1740087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d716173ea08bbf5acf171a130852f36d2e31aa6d202bf187b80b0ab4326625. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/QZ22B1740089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a191c8380525ef27ed59ec340ea7a11c6b39c66da38006cd9f14c7873a9770. 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/QZ22B1740095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58e6e171d716f570670dc039f185ddb64416d8b9c115b5babd80b857d1b5f55. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/CLLH21601090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2779ea2a4e3cc498f3823715f3d21640cacc21bba5fe50ea9f73d7d0441d3f66. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CLLH21601091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46f4098c9a01b4307f104901024c1ea76a3a76e40d2dec3f28b719b7511b17c. 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/CLLH21601095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d0d4988c0bcc0c0e8030a11c1eaaf89b9d195d64ec224144845e1caec58069. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CLLH21601097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979c0dac92babbcc8364e32316e90575d275e28ba231a5b4f46be2ef90e6d71d. 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/CLLH21601099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc84a7aa12623327d8eef06f49871d3d6edb5ec65186f54bee944e9456a1fe9d. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/CLLH21601103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca658dfaefcec2fee2face49a672017605b965cfe7e61f1448289ce363f6a8f4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CLLH21601106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58e6e171d716f570670dc039f185ddb64416d8b9c115b5babd80b857d1b5f55. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/CLLH21601090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29da80fbe477e40cd42dd88f3445effc11e1bac823e025ebaa5ed5bc8729bde. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CLLH21601092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46f4098c9a01b4307f104901024c1ea76a3a76e40d2dec3f28b719b7511b17c. 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/CLLH21601095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979c0dac92babbcc8364e32316e90575d275e28ba231a5b4f46be2ef90e6d71d. Chain 2 (Bitcoin): anchored in block 957632 (2026-07-12T00:10:15Z), 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/CLLH21601099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc84a7aa12623327d8eef06f49871d3d6edb5ec65186f54bee944e9456a1fe9d. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CLLH21601103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca658dfaefcec2fee2face49a672017605b965cfe7e61f1448289ce363f6a8f4. 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/CLLH21601106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ac52b4ca439e372ae1239abeeabe09a38cd93d4b83f61bbb38a531a97b617e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CLLH24603210.