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 0x04696227caf0259758d8a879d057c0adb484e0db590f893b7bd46de65616ea5f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/801a8783-e85f-497f-9f95-1c053a9b3520.json and https://artists.proofprofile.net/proofs/artist/801a8783-e85f-497f-9f95-1c053a9b3520.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 0xf544e166c9f8e2f09280a5350ea3054d44f47188495935a930de9be26af09ba8. 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/QZNWS2034111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2476f666bf0e7c879b020de13583965798ea975a92979ca1234740e044387202. 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/QZWFH2440406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c75fc79d5c15b11885c602d5637f2528ec68b918eb7976b4c8eba1e02b434c. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZNWZ2404619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed3b5d6ecf1ac649c593bf09cf89536da66fb712e9882bef0f3f411ec008fb4. 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/QZHN52464788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb220b722c17dc7db3565714fb3e0718827a7137378d4144ca351af64d1f268. 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/QZHN52464789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b392b9c0ff72c53ffd5bbc0f2fb6aa033587f9497f16f08bd1001113f79598. 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/QZHN52464790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff246c74d096f5282edd89bba398d04f788314e56eb147bcf259cf7c974f679. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWV2377462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d6b902a5f0093e3a11c0c0d0ca8200fcfab38799e75f02798b1568b187f22b. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZNWV2377464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e077d7928f78bb754f4bc2c57973656a2654b0b65e0a8ba9d439cbfe4896b59. 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/QZHN42393069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203d51b1f1672300fb32a7c63ba80cb4fbb7e6c47109740b1e6df0610c0b0f14. 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/QZMER2201770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e18b3017c965bc9169e2601c1bb01c1c3ea6289fafd724b1de2188d9806c403. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FRR642200898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b1e83a2210619f94322ececa427f72ce8d6e1fcc2c03a595c16a090a9fb386. 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/QZES92277178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78dd4c815dd0c2aa8b7375123bb298d9899bf5d9758cbebdb37c72f8b9a8b75. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZNWV2143175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ac7c9492591ef968ba09d71b773df1b6bedba819689d6f219153a0cec6cc13. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN72101242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0216a924e45e740a524c96d8c74e756bf92c99f0a0c7c5cc6ca3ebe5848678f9. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZES61819517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cd5f88cff112e32ac7124e8f3eafaa5b25356af70de98fc2b1a9b5a072a127. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZNWW2332798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490b69f81e956fbeaddc35dbe9fd755dd2c926504dff2a406b6b4dd5f8bb13d1. 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/QZNWW2332799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bff2122ee73e9c09753616f39f237d6b9e036c5352b7981a0be040973c07ec. 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/QZNWW2332800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b2b83458c22de0a0c883d98336d9a3c06082e6adaa162ce2ca88cef2a011d4. 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/QZNWW2332801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832c474d7b3391c85a232a513a25e9325038faae41e9521436695ccd632c857e. 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/QZNWW2332802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b73e0ffbbb4fe45ab312b3c7e4f45349f86154be925b00509cf3bc7b2da0cf. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZNWW2332803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a490340d3e1d71799f8e72060c90aa4b8d3ea0739509a80c44e30165bfbeea. 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/QZNWW2332804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cbd2073b866f102056893d6514d76860e3d6493478bda3e0d5115e0646fe9c. 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/QZNWW2332805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54093ff6b89a048a36a6e80c6f9f9049e53304fcef94b9060b0ca2d6cff7210e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR9W12211962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9898e07b462c06083d100cac73aa0d4824b7d4de26f83aac063d3dc10e81ab54. 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/FR9W12202317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5517eadf00f251fe02e41acf27b011841c9794422553614d1bc18e20acef1c. 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/FR9W12211963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c916a52a225c5b44a5b9e026a0bb1d3696f16f29c12973e3822b5b428aceeb9. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FR9W12211964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2540056fb8cb2e59be3d8390955e6052235dfd099e2336164a658916d63aed79. 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/FR9W12214968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1014d113bd180a1299ad9b7c78f4ef76eee23998af86ffe48dfb3b8f3322cff6. 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/FR9W12211965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc103b5d6bba8ffdb38dfa797da282a34d064ae3bbea37498674cd204e98bdea1. 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/FR9W12211966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf47fa5929405c37a3dc99c09fb389b1877207624d7bb8cae05c74e1b8f4d027. 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/FR9W12114941.