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 0x47d71d77fbd444803b527f3b55198ecccc956caa56a45695064f57e30864e17b. 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/0e3ac24a-9391-4c62-ad7c-961ec9a325e7.json and https://artists.proofprofile.net/proofs/artist/0e3ac24a-9391-4c62-ad7c-961ec9a325e7.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 0x0764085094b82555c6a7578b6fbd99d4dddb255bed05ada2e31621b6650c1124. 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/QZNJY2301134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd17b0d30f1d37be1a13cc367433d3e44295c60d125b592bba4548b4edfa269b. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZTPX2309025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fcdc35c0e09e0e0065972742e9d7cb99e67f045a1f30cc1cd263cc6465ebb9. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTPX2309024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04d08e996338db1b25f0b17ec90525a442ad1417887646cd0f626c45b662469. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTPX2309030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc612ea44209c6640cb855c53515022ba2dbf7bfc5e08554aeb41d82e3be7b49a. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZTPX2309026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa336565b7d01c0e28af82c0fa43269045f8f183c1f45b352f895954e8921bf. 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/QZTPX2309027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689549d6f2862325394973dd81632088589b014f02a6d684830fda89c558a0da. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZ5AB2406867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd86b95e673903da19bfe1eb7e8a109ab96278106d7f3cd3fb06b446636b570. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:31:14Z), 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/QZ5AB2406864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfd84301d964b7bc0af63e862bf2ffb2561898dd699e9e7483a3a95091baf0b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZ5AB2406865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0674f50354cf26202bb6a4868059d4091b47a9fa6a8756e9d27b2ccfe6c7d27f. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZ5AB2406869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73851560ffdb3dcca9be8b826f96967b00bbaab0607a0fb5180c8fe28436199. 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/QZ5AB2406870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d922f1acb1bdf304305015af1023875da9b236e3e3c36644b5caeccb20036a. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZ5AB2406866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcde49562b7570a898b47dac5c28501df284b61fdcaf0306e4876fafbc9507c. 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/QZW9K2410930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84190e553257ca7c65fd58ef4f4c0aa00353e49ca051137c1c45d1b3a2f53bf3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZW9K2410931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27081ade32751ef57887aa81511b3ea016491b783679848facfae047eee6d1f0. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZW9K2410932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d39ae5c7e70fd47d06587c7385b76fcdd61513d7cbaf7465e8152f9f4c34f53. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:39:37Z), 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/QZW9K2410935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36447b200f8f660728941c41043a9eb8ec31a7bba6b4c56fdf429a55fd65e62. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZGLM2567502.