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 0xb92ad8927176a8f49e45752ba9ed9761d63063ddd4b1202ac103786a577b030c. 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/eaabb377-f166-48b4-8ea7-e49f4a2eda49.json and https://artists.proofprofile.net/proofs/artist/eaabb377-f166-48b4-8ea7-e49f4a2eda49.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 0x7d1b3d19ca60b625a35858dd16118515bc99155759d3cac4be613f9b00737f77. 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/USCGH2394746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f201af1827a8a5d6f815629ca535d5c4ff8b832ab3c8c84990470028ddd79c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USCGH2394747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa677644450df3cce8255f4b6f4eb47be96e58ab57190302e2060acef9a2e6fb. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USCGH2394749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ea7a591e9b526f9064639c5278c9db8d4844b538723405a0944837627721fc. 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/USCGH2394750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a0f7574a448cc36dedb89ae87544699e392b4c2e3b92232d70f984e7c354a2. 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/USCGH2394757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6425c5b65b3a7c1b197dfc73a642bd7d2b13b25c9c5e64c14394ae0d995e0f7. 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/USCGH2331374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a2d7fe724b70221dd6febb190db74998dbe6597e5912dd246b5ab49115397f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGH2331377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f20e5bdf6362f504ac10bea4c13620372924674a798de6f557b2da9415afbf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USCGH2331408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d5c2128e25a00d98bc55500534885ced4e20ff821324d057448425bc381d88. 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/USCGH2331410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d628af3b9224b1bed2baca70e69c78e2dcfb518be24977b6cd0359f77fbb22. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USCGH2331411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74db5d97eac34bda888f094d3984eed315de5c43af3233f571b27f59dcde075. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USCGH2331412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444d9a279b487e4571a0a946126179f10f22f3bc4846b6784b16e7af357d9fc2. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USCGH2331416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5e4e00f86e5f2b01bf5e3505d94cce8096623034254b40bd8220443848c49a. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/USCGH2331417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0b955852ac98b72653408079053ff08e7a99e65a4eb21d1444b4f6098ea005. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USCGH2331420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719d69ed10dd044a745c7d9a963353b1c16c2d73829421cdaf9d33bd3841fe69. 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/USCGH2331421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d52f65f19623e1a77ffdd51080549dd7ae4d30713870333bfc2834f7f70604d. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/USCGH2331422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8000b5134cd7d4ef7c1410d37af816101611bba170f1be4d8800340a9374ff. 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/USCGH2331423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33b3ca8a8563b6997b15bd6e7ff244437ddbdcfa0fe2eb3721726dd77c657b4. 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/USCGH2320716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedca4a73093180a4b3e4a6c36b87d7abd9c6939491e43838704f6f3aa4e0b0e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USHM92234585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50bc575dcc6c923a81ea09052976f32251ea83cbde3b26f385ba9b84b2cbb05. 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/USHM92234587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5d5137aee403722fc3fa0d562032dbbfbc623f239e4bb051b0ac31cf275183. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USHM92234588.