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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 0x71c96ff560ed35584bd1da4f9a782859b62bb6845dca8046dd25a7f0f1dcc64f. 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/a04614ff-d750-4625-b391-cca889717a95.json and https://artists.proofprofile.net/proofs/artist/a04614ff-d750-4625-b391-cca889717a95.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 0xd66b729083d07c79c52f0434e57e380fd4525587c7e1ea52f303ce7de3103218. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/US4KC1192001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9a5b7684c9cacf12245b2137436fa19339d4bbe028753f48250a0e287724dd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US4KC1192002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16542ff680e37583e7afc9461cfef575c2ed7df6280adc5001fbcbab2ae3b5bb. 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/US4KC1192005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4db8327fc6b391f4943489cb54cf1b2ef3fd1e4ea4b08c4fc90643e58f126c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/US4KC1175101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcf5fd44a44043305c130b0e3aeaa77dd977f7fca4f17136872701b7e53e9e1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US4KC1175102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08a49cbb5d317c6cea7ecd947575077c1c22942b9837326942f064bcf7e5bbb. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/US4KC1175103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5d5c2dc09b4f10ba33bdfcd6511db4bab9b7559fa33a39a192c71db9c2fb0f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US4KC1175111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801f64e297eb7bdc4c9a22b1edbb95f8a42fa873f7634cf1863773d00833f663. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US4KC1186102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd66db73e49d57de0cc8c08a07cf7a1eb0c7e4d4299f4949b81149160f69dca. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/US4KC1186103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf965accf7f3e9d039e9d9e0796f8f5069a7a2279a95c81aca17deb988dc0c2f6. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US4KC1186104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab256231359d13c2d94006c9477b7f38e40cf1dce111238bad67568f6e653da9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US4KC1186105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b972b056b78d51486cef7986d5c0dcd7b160fab6e68f078d4aef5050f1f0a89. 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/US4KC1186106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863d06d49d6a8327b47c270de05559c0b27f287c4a1bec75dccbe91502d6a415. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US4KC1186108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a1f9182233421fea2d8683c7913b4b1058d36019c9bc87571ebb538dfa7ba1. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/US4KC1186119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e6483e066a341f22fad065cc0a5db84e0b7bfd4311b5440239092089f10983. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZ2YP2530003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e6483e066a341f22fad065cc0a5db84e0b7bfd4311b5440239092089f10983. 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/QZ2YP2530003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4012adcb6a786150481d2d5985484655595e33bdaf79e8e9a54efa968cba3d87. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ2YP2530010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10037670047b645f30db44e5a543db630c0b69fea931697973c200a46524a56c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHTV1100431.