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 0x2a9ba8e8491baf2ae19a22bde3b8baa61810200ac6be8fef97a326a1b7065531. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9100a126-b5b0-4456-91f9-485b1a32dcca.json and https://artists.proofprofile.net/proofs/artist/9100a126-b5b0-4456-91f9-485b1a32dcca.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 0x49ac0b0830038088a69a3657c7ab1e44679caae4a87a78ddb2fc23350ea8cfe5. 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/QZ9Y21781449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb55d70b3950129162cd0ce966edb06622edef0ed2b7922244dc4c0dbd109618. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZ9Y21781452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c2387dfe6392c761e915cab1c3a55b1a2c680a149adc4b742b5a20e3928c07. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZMEN2081448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6bb77af61bb33f373ccfc994afe6268e1f8d9c1846598d769a447e39a31196. 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/QZK6M2006891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ce4ba753060fd2f5851f54c1b3d3db4769f3cdf76db07e9cad2f809bedcc47. 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/QZK6H2076487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59a41c299def9fad253f0399bad59b5fb2c76311e02d675f8dd83b830bf9924. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:09:54Z), 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/QZNWQ2006516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed901728dcc91132e8e3062ea5ad8f1ab94256708c060c17dee771bf71bc454. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNWS2005846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9363f8d68c889882e25ce0d9cf71d337ca3c6a5c1aa1f34bffc02a431d2549. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:03:49Z), 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/QZHNC2044262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d6d373f4ee95933669c5e676828000b8ef8ceeddb83cdec45e37d03c7f7445. 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/QZ9Y21702228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9799e1806ed04efa3221ba66e65d0ed921b49f9c2a2182a55cd42fe2db8a93bd. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T05:08:00Z), 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/QZNWS2005848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbf8bab0dfbe04037af6a4a7a6665205626307e78916bff1a75571d87a53683. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZNWS2005849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb2e17d09d97a71fc8b82b98dcadd559fd5a031d777e7ec4a68c69bf6f6e52. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWS2005850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82cc2dbebadd5003eda20fbe4ea110fcb111791987716552972f6d233dfe1fa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/SEWAU2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae219236ec9e5c09b0eccd5db502e8f01101d8996ffb9bc3ec918bd88ae6beda. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:09:20Z), 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/SEWAU2100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd53d69f6b3324e0049f7f38dd1b3f7849b247ac29eb689ebf0ef8ecce10326. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/SEWAU2400101.