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 0x4589e5f6bde77358bae70fb18e20c0d912ff2ef609de81f7c2b5b413d488b143. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e5e3f31-1eb1-45f1-985f-bb2186eb673e.json and https://artists.proofprofile.net/proofs/artist/5e5e3f31-1eb1-45f1-985f-bb2186eb673e.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 0x857ec12e2c8f51b64759162452d90fe9310d4792c42a9f987dee556bfe7ac3af. 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/GTA0A2300966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1f08b7f67d56bc950ebdb058a1fe24537ea175370d5e6b782b9fb6ae480e9d. 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/GTA0A2300961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6042c0cecfbef3e91182965fad7fc1218c4abecca2bc451f29676f3c0360d16c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USCGJ2234273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742877d01f6035e122e9e021d07c4e8ab1681f0b2e189a253ab2bd3cecc42bee. 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/USCGH2278686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb55e393dd98c301031807b8055dde690b169688f7eb752901f6628bd2002c06. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USCGJ2234274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb63736d8816fbf84e9979f4d2f2d0f93aabd3d62dd35aa608e29bccc75d95a. 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/USCGJ2234275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf270ccb287e6b04fb4efaa5dcbd5e41921405ffdda020b946606d4ee87f874b0. 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/USCGJ2234276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25049db09917c8a3e9af74d4c709a5661a3a06974f372c903476d9882fa1beb0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US7VG1996596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53713589c13ad4be7a40188b122e1199c93920a14386ffb653639a5cd256fe01. 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/USHM22115662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5501b0fb8ab3efedf91b14666aa7f2c73212accfc58172f45f722fdb92cdd1. 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/USLD91741239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41de7a107ae66f023dc41ca6696e2f44ede90d027e730fb2387831ce970c08b9. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USLD91738180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949728321dede21a82c0cbdc21f69b3dd20cce67c5c31ab778548363634b9c41. 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/USLD91741240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5691a2ab06915b17a799ad95a5ba0de06537eac8383f0d6444e4edc306cf1c7b. 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/USLD91741241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaa4acf6f3c55ed8c0fc5b2c3e7269e167fc283e015932cb7fb0e9efc9b7833. 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/USLD91738438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d6b2a0a55097a05e322654dff6b2784a463a67cc38c2965d8142e13fd837fe. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USLD91741242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df7c0fb85acb454184f604790cf4f3e1bd38be1e24c8fd757cf1c335e3af966. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USLD91741243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c59be3081f7ebd8d0ec6359824dfd82d22b53868f371129f2ec41626fe6ff3. 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/GTA0A2410901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683c830335856f75891b15b910d677f3fff6cad55a9fef1de6e4983b14aac2ab. 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/ES71G1932465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2971bd69058f383c8f2a4dc0c9ff70c05c7469f23c9815650d5e508c5c12ff33. 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/USHM91828451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2eccbeab96481f890cc8864f9a38a3d0a30716937397efa3de5c0d9703190ca. 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/GTA111900023.