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 0xd47fe970a695b8fc3bd16483ee50fda1b650d5109f92a8b678f4c8b26150db72. 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/7931dfc0-a4c6-4de0-a32b-9538e50bf9fd.json and https://artists.proofprofile.net/proofs/artist/7931dfc0-a4c6-4de0-a32b-9538e50bf9fd.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 0xeac2f2ed5f4373c4928005cb19d47890915efafd691bfd82938a335f35f448d8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NL4DU2000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178be61fb38dff6b96009183502fe620b83a287dafc8377ef3823881691448a8. 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/TCADZ1802369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf732a9401733883c6d4be8f361e1cb8e1736e0a2eafc7b2810cce99b649e60. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCADZ1802370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723aa9b20656689e70200ff880ec227086e7aeff508b5b714952a956c03367c1. 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/TCADZ1802373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7da3bd20eaa1c9a563e3be1f483d2cd11b8da2e30c4fc3f6222c0688e1317f. 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/TCADZ1802384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf97c3e877f7062c9ea5dc14530511209d585201134a2004b81b11deb8f0b1a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAER2002438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014d69a4b248de7d81bf49acc80a20d92ae1e4e2991e2eedc6cef596b437f3f8. 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/TCADI1723815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe34af2b1606a98b5ec391b10b94fdf3caf0ff6ced7c169c028d7a2d11db0538. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCADI1723822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32aabd22e555de047e9c275c00dc4f25de788cd02a159094265efbaefe556919. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TCADI1723825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cd5956818a3527397e178f2171027b80d7f6523832a108d887bc2618d840c2. 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/TCADI1723862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d63ce3ec5a7a2da4803cf486daf35d4b2068db718e45b7fc2ab701ab998572c. 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/TCADI1723863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c847bc0215935685a343edd3eb52cfafa1b30d54eb2a6bf316f40e1b158da6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCADI1723865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa1b8cf0e82fe632093b33860fa90a6e7de0f95876d196f64fe2510711f684b. 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/TCAEH1967058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632439bf77a94d504fe072767dab83a15a6c2b68059635f6d9e0e367563dbcff. 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/TCAEG1917322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b783bae8c9f28bf3f1eb6dd47c189a1fa20fe6d9b6a404e1e709d7857117ce. 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/TCAEH1967070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a40736dcfb11180b963300a9ae539ccc521daa8a684134fe3525025508a26b. 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/TCAEH1967077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1067977cf6aa2879d246c472ae9def2bf8e9942be34376b21bd8c2efa9812e13. 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/TCAEH1967085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856e02605bffc15d2ebb543b4e215dff926a33963e72b20d3a1b81d295c012a1. 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/TCAEH1967099.