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 0x6339053b20f8b75f64126b21a74562f18c2f40e4fa69f885355fb29b628864b4. 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/4fa87adb-87f4-4051-a418-884cf5913717.json and https://artists.proofprofile.net/proofs/artist/4fa87adb-87f4-4051-a418-884cf5913717.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 0x5f1fe240cda4dc9e4085fa29712130979cb0b15b72f4f300e4417e15fba935cf. 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/NOKRD2001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927b68549576f32c1f366207d5dd9672cc432452b3930ee0bd68a94ff8727e74. 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/NOKRD2001020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4396783c53e43f1bae6ab53e6b32b7161ecc0b9c4caa5a44e0217acdf92a742f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:02:54Z), 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/NOKRD2001080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4445ba8075399f04caa44d0b51c923fb7dbd2efc15732a176973019198115f91. 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/NOKRD2001090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b189de85844e041952c5cded046386a6e087c831c280b367469be5e2533634. 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/NOEQN1001020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bec989c36e54326f1c211d2381cb6fb67e3ee044002879bc62679ca56b5e06. 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/NOEQN0801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1dc5ffb621af038b1e98326bcc51eeddd7a9313e259da102085ee9adda2752. 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/NOEQN0801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc43612561fc7e821c12364357ab360b416a08693cefb97170701cb846c9eda0. 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/NOEQN0801060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442dfe60151174953feac82af266e21454051ab56765fb80d55cd90dc8cb0c36. 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/NOEQN0801070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8daa5a59a06df3189fcfc9e4e8527a2add2c8bdabd80af1eddf87ab24e5ee8f7. 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/NOEQN0801090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9783ff21bfac390fff63939b20125878fcdea5f139c8e253ac3322f124c2fe. 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/NOEQN0801110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2367e0c1a492b9dbc9fab6068a97c88fadf18790a50374aeca34b8237a7ae9. 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/NOEQN0801150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244b50a18e81308820a71c28bd23502c6bbc8da3ef9c835f679c88eccc08beb8. 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/USCGJ1529568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa850e36b7b4ed46806ae8bc2f6bb9e0592e6ecbcd1b73f84e4064eb1bcd5e40d. 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/USCGJ1529570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4872d47d3522bb3c86827e33c4d76369f97b82fc50570f07e2fd7e5a650b58cb. 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/USCGJ1529574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23d20f095e4822531a86899e2940ac28146e8c5ea5af7d8e475927f9f9c791c. 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/USCGJ1529577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e5fb69806061479d7244098d3c3e5f7aa142445af2158ee917d4b383ee68f3. 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/USCGJ1531087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6781c31a0d87c8f8a4e054e6a4f38e2cf1ffe9c03f3afc67858c7902d03b139b. 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/USCGJ1531092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755bb2218eeaf0fbae1ed49ff19794115fada343d5bc818eb4c06a4513a96a79. 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/USCGJ1531093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f83a86e5dcd064d89ca78bfebf8518652c76e228ef3f715bf7592db30d1a27b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USCGJ1531094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869aecd1daa0964f546116285835357f91931537ed9c35fed9b276fd4f825e73. 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/NOKRD2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057e5ec57d76f9e69725054d0709331d0a209f42cde77ff1f667aff83c37c004. 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/GBMA21892055.