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 0x499390ad6035b1387a90ff103825f44a1761837948266ef6546d963db5df095b. 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/0e429578-7b2c-4204-a63e-cd48ca634386.json and https://artists.proofprofile.net/proofs/artist/0e429578-7b2c-4204-a63e-cd48ca634386.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 0x2373fe0eb12bfbf9229784a373c33a64ed4fc86bcff457cc13d2e2ba2224002c. 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/GBLFP1507393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd60eb75fb94e2eb6a52a8b99d9c16480b6eb448281af401054905fa375e19d. 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/GBLFP1507394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff9b058eba2ef697b7a9ffaaeae7460541ea05648c2911aeec92c4e515bd9e5. 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/GBLV61518537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb80955ede9c7ef2e3631e6a2612501161f2ff8ab498c8ae851e1c0819c1ad5. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GBLV61518539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497370571dc8bf243fab3451a35c4600bcddfd2f4f6f60103d8d1c66aab2c7af. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GBLV61518540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc298c5d87dfd5cf47b63f98e5d0777d1278b1ad035393ac9fa083cc456f5ebc0. 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/GBLV61518541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf789aafdb2c3bcb60f0708374be9f8daa320ac40885fdc419eff69bc352cb197. 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/GBKQU1628112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20be5affdb1817658e2c7eeda6c259f110469e80da58ae1a6176d7e2e9ca3f54. 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/CAWK51600049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3254d1a229d9f9406ce2df574e7960c776ac1b5ec3e22a50929ca5ac4845446e. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/CAWK51600048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d86462f2ac4792de398f2a3c5dbc19c4e6157ca53660d76752c7f08fc9fb7c4. 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/CAWK51600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094ffcd46538a9114c63d9aaf5db0947ffefba45cbb059d80e49914061bb151f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CAWK51800213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b426547718c5ad6ca7e3a491887e3e4535cc3adedb5f8ea61c8db941d793b9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CAWK51800215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7734f212bd233ada2330311d1c6a751837fd07427e8e3742fa8121b20cf9cdbc. 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/CAWK51801113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403eeebb149cd7f78ea7cf558233a37920e7f725bf9a0015f78ae52e08d5c114. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/CAWK51801049.