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 0x18eaac3fc93361a7bb14c64eec2c4b19962c3a0a7c567f04ebc5a22bdfef735c. 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/f0c4f2f7-4ca6-41af-ab04-758c62a0a124.json and https://artists.proofprofile.net/proofs/artist/f0c4f2f7-4ca6-41af-ab04-758c62a0a124.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 0xde5df191d8fb3e3f4e398e73a50275f4c53a248c9ac7b7dd344f0802d9274de7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FIMGM0900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5f874c7097909d0ab3a442d9ab8793ea134062f3031e9a2c84ebe7dd4b9d70. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/FIMGM0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ffd37eef9d8fcd622e1f94433bec9e5ffd08683be5b698b832862966d9bdd4. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/FIMGM0900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbb27c05a734f9bfc90933adb30d716a73e0d9ab5ac8a2414dabb2eb0fcc0bd. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIMGM0900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762adbc349dc7d1460a3f4f6f491703c456280faae1247be5d309f18fb46329c. 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/FIMGM0900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbe366f4502a85f1eaea914c6a3c06e66f440bc7f880d73f4bff85670837094. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FIMGM1100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a27b938cf017bd88198117274fc056e852cbb099317fc2ab8630e45bcc4c815. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/FIMGM1100075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c8dad9d298f39006fd3daa7cf01c1adfbb2a236dcaeaf9d498a80d029a555a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FIWMA1400107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27819e9f06df6aef9885f216fe1386f3a6a39a98c0547b8390292ef112d808e1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIWMA1300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02668160000e22afe4d440cd5c6e0e236b8c29509b1a2937ba364125a602bb9e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FIWMA1400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cf7d0fce0b2ec7131a9147e220fcbc61db9546fbdb0e2e85fbb215bf5afe2e. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/FISIZ1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df1117036f7ddb59ffe557c0fef95798ac58a7914bfe63f8f17898153762d28. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FISIZ1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87987779618cf6b27249597237be21732158dceff996699d8b1369e13d8c4448. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/FISIZ1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c92e5082a5f2be6fc0ed30fb076a3611a19309da217169ebfa2b0b597d2601e. 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/FISIZ1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7c33085164563daa1145c0dd549469fad41b6c7e55f4cca1e5af1348d292cc. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FISIZ1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1c7d293143af2059b4c518bdd44482c0977a8d896032d6e4de2f8a5e95f3b4. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FISIZ1700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf0b6b2927beeaa453429997706ee6981d32622064290d36bb0ad67606dead9. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/FISIZ1700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac64946e54a6b742c31e981f993d29f2a7c4d2bfe30ad624006dbd474b06f07c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/FISIZ2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae17fc1e3324692104bd6dc038fc43cedb1309c95d9c64afb0659a8af7317d19. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FISIZ2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5ff34b4365e544335a81dd788af966479980ed34b67d3c955158ae44a998e1. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/FISIZ2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea91b84ff9d2d085e78981de0889f8736942f37cdb84555d154c5a3d082abe5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FISIZ2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcb7c9f82ae3241248f517cae00ea266b74da815b570d72562d925664e3084f. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/FISIZ2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f729dd5d958097ad58b3872f87bcd5d855dd4ed5f510a8b11fd75bcf099c71. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/FISIZ2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24de53a3b9f344b6cec5e42c987aece60d317c1f740028afe677b11aed510f82. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FISIZ2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4f4b057ea695b1b2aa426a9db0bd76a2a4dd1b627c6aeaab9dc938ee645e5e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FISIZ2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974512fdad2b51a40f6bbeb669c29b5409157ec0135dfd9633987665629dccdd. 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/FISIZ2400003.