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 0x262c403a7847510ae1539dd0155d000ce62134822edc12cdcdbc14eff8a3bb99. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3bfd44a-ed57-4d42-a28f-31689aa1c226.json and https://artists.proofprofile.net/proofs/artist/b3bfd44a-ed57-4d42-a28f-31689aa1c226.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 0x54974054935c64301292b3aec76a85661b64f20d12e62290a537edfb79063269. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWB511692401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf30212a82a2384517ebcacb0a5e265f39668c9f34b73b127ad2823bd6f7d0b. 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/TWB511692402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fb7a06dccdc83ddcd731750a9dc9d79d1e0bdcae5e19bceb49b6a46e4fc8bb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWB511692403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1dab2aa8b01423fac3620653018e37584470c64d15ca2599328e2817b36d4e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWB511692404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9a57ffb333ec61c986b81c9be88b1c25cba8730e18cb6f8e2f9eb8bc789e42. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TWB511692405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a21756a0960562597f510e00f15aa25196ca92e3ee052d0581c345d1416645d. 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/TWB511692406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f0798099c28e332a1feb6db247e0943891460d2ec2af3207f7ade6ee4b7fa8. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TWB511599013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6039a48eef377e4d5f09156209057cc61a6e94efb88b3944a4ca09ab1723ddbb. 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/TWB511487701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468d8872543de832d8a42d8e179b200832799a2891d304a19b74a5b6b9b2b67c. 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/TWB511487702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d06ed131fc342ca8b3195d27a65cbe835694576016ede2317828a942a753442. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWB511487703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0fc7619feb4a46e479675f04ad9990bfeb795257a5c06af0151e1e4c2feac9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TWB511487704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb977a3cee91b22bedb6a81fc3a5532c9c0ba7dc1b45269b49ee3a109531f2ce4. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TWB511382202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27b679fa234ae167c8ccba2b036884d260c2f0a29e4ea6384c5a10b4d2db844. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWB511487709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc8df1bf3d2cccdfd7fb2ec3eea04f9be5fe9c8abfe6310736f3da8986ea35f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TWED12300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dca8f3146d5d0ffd6646548138e0aa4d93ebe174c18de9f92af58705a9aa80. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TWED11900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21fcf2f65eefee5d27f4e1fe376cbc9f1eab2e049bde36772588e9091f93869. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/TWED11900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51667b097804ca31d0719ac68e29ecc83c5adb73358227cf051ee97f9b6538bc. 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/TWB511382201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1149598622f1362284945ebcf796142461871e6a48a025cfc751ff320b37664e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TWB511382203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e0b42e29680bcb941cfb52bf55666592cab6d92d6421eca635cb8b53327e88. 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/TWB511277202.