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 0xc288a0c1dfb2471a6a445a9d1a61457a068dd3d479dd2a2412d6389640597361. 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/118739cf-7dad-4b2d-b436-a98e0d4e5a3a.json and https://artists.proofprofile.net/proofs/artist/118739cf-7dad-4b2d-b436-a98e0d4e5a3a.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 0xec8a18846ef8577603bbb46de401abb86ec035090d14e75a93d3223903154fae. 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/QZNJY2366186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbad83ac1cb85b87565da2f2de9da2e5a375c671def0f4d8f6d99ed2e2c0bc05. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGH2476165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d9c7788dc779a45c26f5fc9936b3786325e835677087a05d845fa0fa9709e1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGJ2437243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb572e0e6df05b3867ef00be0739b8d91be618830ac410832043607368837593. 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/QZGLS2478163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a04d143c8cb74fa09e9aba1908534e53c9844a4aa8b46528f01b539ae4a4d33. 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/QZGLS2478165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8447c63663935fca4cd8a77cd0f7e63035d86d30e846744cf50824f527219dec. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZGLS2478166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219a18346a3e8a425b2eb93eb7ac1d257a7d71049df5069b18c6c4560416aa07. 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/QZGLS2478170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfc89d8619f816aea9b5068e5d036566cc37db3af88e3a11333165ae45613a0. 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/USDY42471272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f11d72dda69955d9797e9841b59c417380ac07e3567b66924714d55ae1c90bf. 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/QZGLM2514425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92805dedc3b3ad405bc161e8c46d87c3b58a96285ff7761fc46df9b4d20953e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZMZ92548201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1155d35ff2ef0e960cd740c98302453d4747a39c8d4176532bf4451f05bd0d74. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZGLS2449978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77142608a2a1c6bda7f372a1693462d9a84dab6d49ff3c7286c02f5dd1c209d4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZGLS2449979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d511118bdaabb6b94f9bf2a530f8edb51cc5b14eac30f1ba6dbce450489a08. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZGLS2449980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bd86a59476da073ff37ea61d7103c1413939c1a4ae2d9dc6f7f0ebe7b52211. 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/QZGLS2449981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22add0c75b60cd76de91a0b3c5a6e5b6dd6afaf3f875277658117ecbaf10b98c. 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/QZGLS2449982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b4b4ec8043c8d8b88fb3266d98dabade763c387d7c278805df3568dd7d15ed. 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/QZGLS2449983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cbc96934431f81af055454b8c7ae583570c608fe6c6d462f7365df9fc9f992. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZGLS2449984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd98c20610272c227c5f538236b2a4470d5856a7f91deab1328c1825e40d8fc. 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/QZGLS2449986.