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 0x9139d3294b8c8577499e4ee50364414d4e5907482873da378e6fa8648db24659. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51859714-466d-4cce-8afd-da098e58934e.json and https://artists.proofprofile.net/proofs/artist/51859714-466d-4cce-8afd-da098e58934e.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 0xee67623f280f02bcc381f00da443e786b537a4e1720a10675fb8516433cd17c0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZK6N2445032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8439a4c661c7b2e4a33c5d8b9d7ddb58d6fd3de1c751278a770529ea1538a7c. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBKPL2158934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c62ad7527af02da638a8bfa83e7b630c48bbcc9e7c95d1be9dae3272a7fd51. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBKPL2155743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c82e677f1a6b5a1c71696424f0b1de30ce191d72e33a51cd67fb75542504be. 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/GBKPL1979723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9f58b0e892db2a98ca3983e1084c829f736eeec7b5f6be6d90e31bcc7bc8b0. 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/GBKPL1979264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1367f8858e826e35b54223c4fd8d19335170e11c6770a759c267d4ced3f4cc27. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/UK6821716644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5eccd546e8ccac8d66f65820e4cc053695817b4231933db0461b2779642e9b. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/UK6821716645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda04bfe2d0157fceeef2108b70ada44dc20a295f17ea085019bd108251a50ef. 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/GBKPL1948671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd03834b8327ac4cfc08d8c2371040e7e388cf3b002ec285e4766cba7477660. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKPL1831722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9c13596aad009c186d04378225d2622553f937933c7e87026b6e879cce60f4. 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/GBKPL1938291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb82d09dc412c7eea6721be950c32b1efd42e96234c3d5ae7e6483b4f3adea29. 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/GBKPL1949494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf309b2ccee22bf10e1f889b28b0c54fa4bc717674563a764fda3ba1b13c263. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBKPL1949493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b34c0c0a0a378180f67a6c6c803d16c0fc2d3399d05c50330107b31c78fb63. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBKPL1949491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82807966720cd6ba2da4e97252dd3d809400150edde444ae38c689af8d3134d. 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/GBKPL1949492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bf88447f02addfd5299fc889750476f34f72f97147490090cc6c2dd10ecd5c. 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/QZK6H2111468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74535f9e03bc08dfac3ba6885c49b7b8ab1a2cb4a9ef72e94b3da297bd424d0c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZK6Q2188682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479d42ec6812e44c177d95e2b758599e0deea2319803acde17bdedd31d13bf75. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZMEQ2167060.