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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f2f5ff366214a7bb947a3f416c14bf4070fe42a303d51257cee7ed71c44991. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4271b3f0-ce5b-4290-9df2-7990fd00ecb0.json and https://artists.proofprofile.net/proofs/artist/4271b3f0-ce5b-4290-9df2-7990fd00ecb0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342bb3c914f3f15ba1aa96079ff5622768a6141c52fab3144aaf93dce5a7756c. 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/SEXTZ0700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640112f4494b246ec4f09fca17bd3f8f7883ecf453324d8f5f07af6b92fb2f2f. 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/SEXTZ0700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf6d05e8ccf92ebd53f3cc8bb30a4603291f38cfdea0e5330ee4eef5c59de79. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/SEXTZ0700107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48f55f9ef7162264e08ef02818e74fbcd1587742b6f7c60c9906b679da5578c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/SEXTZ0700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09536e6418362c202d60f29a00f821109ceb1bc4f6f4882af85fab11b2a6474d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEXTZ0700102.
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 0xebe20eb0e7c9d09c642c36f75bbc6a7142603e753e77848a2d6046cfac8b6fe3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/SEXTZ0700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630d81816f4df0b82e05f8bc501449fd41deafaf44125e51dee3d41bfe3b1f45. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SEVOZ0950501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a5d5adea452e0a9fb935f7b3ea3db094e7138d0e528b687ea41345322f5e14. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEVOZ0950502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cf09d7cdd5a3d793e9f5bcbe385032c3e3b9e492acc8696f8908196f4d998c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/SEVOZ0950503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1284695f026a61a50dba6369aedc896f6c16e96bc2f7a2457d451e114e52ecad. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/SEVOZ0950504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287d82cd4caadeff92506129bbf69405eca12cf04c871543e772649162e93d35. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/SEVOZ0950505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14b83d49ed42225e71cb182f0a857e653933c0d61a74daded02b17dfd13cf39. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEVOZ0950506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e86b6a5d115d96cf5395b3fd41682e890991abc5a9f9d9d03c39853dbc6a8f9. 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/SEVOZ0950507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bcf88cdc0a88c08f8fa75e0ef50f74bc8c7b08808d196ccf91adf9117703e9. 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/SEVOZ0950508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d758b484232aa40778b755bbb00ccd52c8bb236be479553d863c661d6ef0f0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEVOZ0950512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5940e12ec871df1e94eb92cc21c590b65e4cea59f85b7e414c829c6fb79157b2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SEVOZ0950510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7557d20e31a95b61ba744166620ce8477da1e3df0feddd0b798bb9c92f9070c7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SEVOZ0950511.