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 0x2d62d8ddb92f38b2ac728182381fad377067904b39c578a9dfe38c38e862549b. 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/1fb735fd-33d9-4d41-b505-c65657c03d9b.json and https://artists.proofprofile.net/proofs/artist/1fb735fd-33d9-4d41-b505-c65657c03d9b.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 0xc23e38940fe4223fd71052797736c1a4bab5298035d1fd4435613a6ff0f3c79e. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QMFMF1585492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0b25b535c433e0c07e2a639f10e03feaf48ace31903177f525d75419e117be. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMFMF1585494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665148e58c67259374c06a5500105648d08fcd28fb17a0ab30af9490d65dee25. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR59R2191480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d97519414024f6f15681cb48893dbd31f46bd36d8996b0677c235bbbe634576. 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/FRX762144944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6043e31c9609c48be2604c5c54d89bf60e6d2c9b284ff89374a201dd995a7e59. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX282230921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8a3d74ebe9680938adac802a1ce94c5dbb305765649681268892527aced204. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/FRX452277173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6463e0f60dc7c29ceb7b4bb31676ab1f8af3e6f629ccf4ee71df46e8d1d3e69. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DGA092317405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fa04402c75da08e36380a9e46bff425abc48f28e0c97ba1923a2364e5fcd74. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DGA052311318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0f6f490fb23d40eeed0c52d6ebeac0d2fb03fbe2591a91f2f1d70ab3266f47. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/DGA072462238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306b6751aceb5c15354fbe90525e78d13af74fe9401a69381dfd84e911080ed0. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA072462240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7fefc313126f97ceabb0888c33fb5878db9a7c1ffd2089b85d5d67f847f4e6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA072462241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d636545efaf1597037ebf1fbf1af51cf6e0cc8cf60546141fc9961dc6615a0. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DGA072462243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7824d43f8d056f6604ee1030d0b94e8aa6aa3bd7834dee4148f7e9ecec91a72. 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/DGA072462245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bd41c4b4e5a47ea10c9da89dd01735b69d7fab6dbd2b5b0b641b87d814c6df. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DGA072462251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3741d8a2875c463586d74b3747fe0410d7137b0cd84a650e5bf9ca0211407cc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DGA072462257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e8299c7cf8c07d42f9030ec4904d965be60ffbdea799b5db07778c3f51b4f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/DGA0P2442078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9fa3f811da22c65e7208e1db0c6f5dc3d811dc7b3f347309a4e5a5e909abe5. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/DGA0T2438515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe710000cc63187735d00da435cff07329af01c6d91d357c58d6079a8b74ae83b. 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/NL8RL2549565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6553f194e161974387aeee901d81da501e7b610681853c1907ff1fb8a35d7bee. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/NL8RL2567420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2e76b0cb3a3a9fd5dd03e461819da314dcc49be08ccf955aae675c7a305349. 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/TCACU1634891.