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 0x2dd5a3bcedaf40b9a1b83da01359f2dc437147f4c8e8c4b57fe635ebf350c95b. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0ef0fd4-607d-4974-ba14-7338255cf14d.json and https://artists.proofprofile.net/proofs/artist/a0ef0fd4-607d-4974-ba14-7338255cf14d.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 0x76dcab6b92f0b61b798bcb13f7910141612995d2acd44e9f9b140d8747ffd7e2. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USJ3V1195397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2a7c9915aa231dea594662c1a362e8180a938955020211e4a70294fb624bc7. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USJ3V1280915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7cabbd9d3ab0733512d2721e6ed5ef123b128dbd6668b5a1ae3f5290ec17af. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USJ3V1341113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5970db9a5f21a28fc57751bddee66c6a778ce9213eb4557d53983563d90307. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USJ3V1378176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4567c66acbb6cb885ee6c2ba9fe597756eab527968fee8318381d07667731b. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USJ3V1449688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384ba3ebd23d2f9e14e658ca64404c6ff980e04515caf31ef40168eaf309ff3d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USJ3V1456389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd072be2567500518c5a477cb3e08b906fc94c672cf4f95154fea8524645588b. 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/USJ3V1463441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88171ed824c78d66ccf434b4514467b3a447b83856fe229c43b702294ae3aa4. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USJ3V1477418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55071f8f2755e055e323a805457db671d4c7a3f79bac4df9d28769ef8b603c4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJ3V1806605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f24eff3cc054540dd233536f896717f0ee3675844d1a949b9d4a9457ce74c63. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USJ3V1829749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8da3887efcf7bce9520bd2b4cedc5f7afb20224bc2cc803247d82b97b4674f. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:21:11Z), 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/USJ3V1851524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f42fd0e11c1482f5f033993d224d14097ff72cabdd4983274805d407e50e90. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJ3V1895832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeece440eea573fd0a8349b302a3786297abed2372c3b7f6471bf36ba5815dcf. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/USJ3V2009800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed15921c294ec6a2ed7466b129109563129e6a4c220f97d42ab7328a45327aca. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USJ3V2035766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b8d2cab8470c311af5d2110ffb6c63387eb24a6babf7cd8607de299caf0c23. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USJ3V2053900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8e3c5bc95e8f8f63031bc3f1961e276994014e446323d4526668642c59569a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:18:12Z), 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/USJ3V2079380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaa4a49340a6779f5a0657f8d5876a85aec648e40d3a53f72a25793566c6869. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJ3V2114814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1fb6ccd7f1827a69917db619ca48a5ef5a2e7066b9167a2766f98fcadf8775. 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/USJ3V2441805.