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 0x6a9f91e1be31054095d2d428150eeb77f18681703dc94949a93cb9a5f014cd7b. 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/ff03a564-12dc-4a11-b87b-459659c0c89b.json and https://artists.proofprofile.net/proofs/artist/ff03a564-12dc-4a11-b87b-459659c0c89b.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 0xb303eb1560298d5469f12a4ac07d24995e3bf3e6821a935730c0bcb1c3c4da86. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAMU11405751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fed39cf0a6f66c85f8ceffa77bae957428c7cba972fc37b150b0c50da3558a1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UAMU11611246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a23fde78e631defb697ac9d4173d5f2d6c061be34e9cde04df4ad956b9b981c. 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/UAMU11611251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefac5ccefcc205f00c31cdb3304797a7121db2802d31dd8b9e7bb1b10d9ef451. 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/UAMU11611256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5094df1be48c80256532e96a25e5ade2b100605144453fc94edcfdab388589. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/UAMU11405780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1fc4442efa479b3f4330e3aa6e7db7d2d54d545a5d3d81fe043f22ab1152d8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UAMU11611164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118bd466d8cb3db5bba1f99bc52808fdd448074875b2a303f4bd4e2d9b6928d1. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/UAMU11611165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7719e15cafcecac38643d1496f46e5d69f3ad62807fe59b7818de9f95c4d4702. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UAMU11720418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa818a24568dc010e749c9e1a55ab37dc0611f027c9deae5965e950fdb6e35ca7. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/UAMU11720422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278e6119aeb170b8c899c2d5f424b9f4fb17b96d85073107b4b5d88da906f8a6. 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/UAMU11612313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c80a8da05c995bb7316381aaa73b3f43c3ea5bef9d688c6652f11b9a79c4990. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/UAMU11612314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0aa66ae01a0b29691b14e7e43ae3a7e5019b0c22c60fa387ee094abbfccd64b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/UAMU11612324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9fb948be85aa6ff7c6d9d6e96832795fb7e750eea49550510a9f2f62e03beb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TPTP11700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17e02989d0b9cc0881c3951202a38ca9e029989a3e724fdbea06dda73cf8cc0. 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/TPTP11700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce006e2600753baa87a70a921951d5fdf6462d278cbf5b66c1b25e6f2c46a107. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TPTP11700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62705fe99232c7df85b006f3276811d1451e29ddbb8c2bf47abdc8d0c163e1a5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/UMA161838758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb4a4ec0fb9228ee288ceb4080deb0e2f7182f23bf032c0edfdbd5a5d81bb8f. 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/UMA189070891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ad7a8b6312e50370d295e286fffb22d92858fd578ffbf89f30b84a1317c008. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/UMA286429887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d891d392c7b8b3d6d749fc09fc4ffd5c4e9db5e0065b7a571e810fc06501bb. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/UMA307926876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8483ae7c030510694bfd2bac173fe0ecb9b0deedc9a7296f3f1878d81fbee742. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/RUMU12314666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce021ee786d7625efd153feefc94fff5a439eb652f44153a3e169d50336cc44. 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/FR2X41873495.