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 0x2b6f42ae0b986a549e87b6a624074c09b6137b176191bd460664252e2593c682. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad0df124-9018-4c6a-93bf-f7b7478e7c1a.json and https://artists.proofprofile.net/proofs/artist/ad0df124-9018-4c6a-93bf-f7b7478e7c1a.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 0x474e7cab04e3b9950d054134d56376c31f0a6287a9722ee8b20133567195c37a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN41936597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4631ab7dc1af70ee4ecf53fd00be38c0c70531f84b7bf53f84f0618d0616e3. 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/QZHN41936598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25861a86bd7d3ec91f8e45eee687d7b12bd1943826a67552fb7b5f000f4e3620. 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/QZHN41936599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0eee1d0fa8de297d9594f0bdd6faf142388913b1a133a1cd72e31baa478e065. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHN41936600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1800f3fda18baa46cc15e28effc788da5e0f4f42a7ea8785a1834235bf81e7c3. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHN41936602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5303bc1c29358bdd630c14b7252166d218cab392cba000147d797424eae6dd1. 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/QZHN41936603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728fdbe7c75b3777e82d463090fef9f40ee2cab6dd91a4d410cd6c1e0285d98f. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN41936605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dafeb39a7d0ee7ad6c1243c49175849dc431b1d1116803556c117ddefd23db2. 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/QZHN41929271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba8fdc56b97b08395d530366088573ea388d1875b614a3f343276dfce5f3664. 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/QZHN41929272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d23b25cdedb251c5065f209b4ccf99b25d58a571e931d474ccbc00a94ee09b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHN41929273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf26f3039e50a287ff48dea8cf8caf45bf20f2dee9d4f0733ab7d086b66cf15b. 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/QZHN41929274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82efc217716fc050ed9742efe26249a44fc580f79d77b5a59eb445bfc04da7ff. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZHN41929275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64eebab22fd12aa4476c06f6687300204954d7cd127cc17ccd30018a979f7ed. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN41929277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dea26764785a454fd865291c401137e8b17373ae4baa6ef328de43ea526a9d1. 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/QZHN41929278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e95f1126e790bba14573a772435b2258f57c48be5dfac68cc5c6426eb08f95. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZHN41929279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bf7ad3bc9145f3a0be665328a958313925146eb505c8943d9f11fc6f2c5939. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN41937651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275dd9911bb2446effbde14dcecb94f9a06a2341c9bd37860edcf2a5fdaec7a7. 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/QZHN41937652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e7cc99b5bb775b0518a53b54792af89cc59443620be3125e93c89320315e6. 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/QZHN41937653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6c52f68421cf1b30e72de93158989b84ce982c30f25977f91994b5e2623eca. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/QZHN41937654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f31a3a2128fe6f905e176909abd16a8e7ccb71e735da4c99be117a523289d4. 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/QZHN41937662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bf3df1f87fb654e78d721e0c6e14857dcccbd741af24452d07f7245e4dd956. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN41937664.