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 0x24b43681cfe44212ecd6e491f7b733a710c5543096445ac8a49d2f65460319a8. 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/9875d91d-03d4-4ec9-8cfd-bcbc43efbfc5.json and https://artists.proofprofile.net/proofs/artist/9875d91d-03d4-4ec9-8cfd-bcbc43efbfc5.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 0x93206fb220ff39645b9a03a1dc053301648b9709476dfb9586eadeeb1f027a65. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZWFH2350672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920a7b5bbf825cf4976e47c7d328e3e64e5f7528440574e687d653590fcc8f96. 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/QZWFH2350673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9cb971172d5626b632c64c921900ae68dda112ebcebf8232bc581c6dc77099. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFH2350674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58c7620bee9e1a724b4537230336882312d22c4a59e80aa78c5b0b22b4a4664. 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/QZWFH2350675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dae7bc559839521aceeb577d34203a8d085b2e49f6a5b3dbdec3615493a2e0. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZWFH2350676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25692636e93941eee0306118efe221a55a87066d9adffde155dfcf6c457acdaa. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZWFH2350677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92485064c91ab2d77a93e581decb3fae59cf0797a0dee692efddfff5879b1d01. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZES52405454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffceb7780b9f371bf22a533af6ad1b28cc42f5dac822443dc0744bd24ab0f273. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES52405455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc6ffed6f5991b425566aa88ec6025343a03c03203ee52672da6110852a0e8b. 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/QZFYX2444245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57189ce5fc8c281a2234362bbbdb37e63a8bab26993d25ae60abb06ff54997cb. 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/QZES52405458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92128484062adc59bd84e169c25a16cafd289a4555888daad384bf8817b33a0. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZES52405459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3605fc15f165a0d63c63a14a94550897b82eda196f032ab5ff50d72080df6d19. 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/QZTAY2483510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac8b2fe92f8ba04c51e61886fd4e145f9065a1d48b5b253f9f69ec6a1dca052. 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/QZZ7M2460216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f787c4e090933f81467465699f1d0f4c565aae9cb513a8f1c40ab5e5b7e6c02. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZZ7M2460218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865b65da0151684926c65b80833760fc5bee80ef0e7c4cd383ace35480258790. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7M2460219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ace5586a9e1407b65713a9d59322719edc6ed190224e132c233c18ebb74a645. 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/QZZ7M2460220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5e703254a307a4328189e1a30ad69ab840b394e41241854b45297ccfc1673a. 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/QZZ7M2460221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e7e261141b09363c4bc42ff67690e4f31ac923b0287f6dfd6e6951ef645d65. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QT3F22455055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbfe6400bc172ba42773703106c6930fd2afbb4093d531757f2465960311a17. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QT3F22455056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608dbed6507ec29f3f7d87c52d427dbe9fcd879ff49aca429f2bd0d2de97d4c3. 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/QT3F22455057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece7be11a82970c0591d3ebaf6794904a5037f9735dbbf2d53e1434ed9234069. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QT6EV2541128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9824cdbc0e6d183cef53dc18490ce4deecc8029644cda528ef5a1177cf5069. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFL2383066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb62fbdb60eb612f48d3bdb3e0cb84a24911804239278fe2de06d72fbdc6a62c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFF2319012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b618372f42921ccad8b1949562354055d70a5e260ef238f6a274e210db0f05. 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/QZFZ72434820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d73e7181a9c8a139db6293ca6648d72c11fd483783fc7b549f87fe0f263f373. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZWFF2454791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef24ec4c96ce7295cc1410dc74b8185f81b1ffe7c8106c6cb46777137e5e5bf1. 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/QZZ7L2422905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48804b9b55b06ec9115ed95e28da698fb8a58bce24d1311984f5dc27a52a9c88. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZK6F2491642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fe0de5436a5cda42977ffafcf9897ee259dc31317a85e295d3c873b8353ace. 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/QZK6F2491643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48990f9778c2827b1753f47bde6a0cbb7a2520cb8e6ce94f596db94e9f899da1. 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/QZK6F2491645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7016a41568d8705fede9dd4931439a91a0877ea1a7c67fe8248717a037e94d95. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZK6F2491649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559ee98d6f7f0ee9ac6573eaa68f7385c38737115b7c7ad40ab02cd5b6124c3c. 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/QZTBE2389279.