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 0xbbe843a27bc70c94c50ea523e5aa2683a4d97a0cf1ace6d1db5e6b399f9aee23. 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/251792b9-1398-481b-9030-c3cb4bb8ce25.json and https://artists.proofprofile.net/proofs/artist/251792b9-1398-481b-9030-c3cb4bb8ce25.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 0x69a4e5a5fa03b38773c504359f425d114ae63d5c533b5276718dae9adc943c6f. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/UKR6V1910744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fac63f6eeeac452740be31679b0f6ac154c74166d437adbf552b47655ebdaf. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/UKR6V1910745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f2ea2eba63a2c391da27d2d496fde094f2736638d43a9b554bff991e72f7d6. 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/UKR6V1910747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ca9983027a7dfc484321c158544c062caa30a2310ecdf4002a5919da3d6ca0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/UKR6V1910748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48984323e02f3c87da9c45ca6a289704d411f4a57ebe404e8e29dfe9964a597. 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/UKR6V1910755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7cb0e18289586cddd573277a73d4f04963b73d05fa4a95288e54d9976c9627. 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/UKR6V1910756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc823b5826e48bc8ade83e0fceb72dbd2e4a135e37b0b1a81728d1d604807cf7f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/UKR6V1910757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a39e86559b7b3670e03da38166904909fac243a3387d368388563805f85bcb. 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/UKR6V1910758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dbc3fa7d15a7f1d6cad3f9d45ade022d4dd498734fe9fe1246d88d374e90fa. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/UKR6V2210509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c86e1318bb099b2616af44003744de23c27e6db1a87e6adc0a05f7ea5ccf9c6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKR6V2210510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c4a09e1d36314a7bba186ef6bb922f259805aba2974fa53e3429a83b430fb9. 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/UKR6V2210512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085d02ca4188e1b612c3b3b3ee6212528e241421648ca54ddf1522463dd192b9. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/UKR6V2210513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764a2b4ddc3c679dbba968b77f9d35156cd183a0cf42d893a99cc3155d70df29. 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/UKR6V2210514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd1c51155d62664dace2572b337bccbbda7e8e3998ab458e5fec03f8acf5744. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/UKR6V1910760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd3721c8fc35a4fddb33c13a1dc4c3de343b4ca88ba8e40a6564d832d5ee56e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/UKR6V2210516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0845421e257c0fe45af5fc118ac7623ee19ebf1afbfc72bd19c47d3b706e6573. 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/UKR6V2210511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4464a5c079913f5f7f6e7b696e37e6813ca30f4740944b2c34cd1858e9e3db6a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/UKR6V2212317.