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 0x527f9131b00acf901aa62b6fe99fd72cc5aefa9d71ace0f577f1f9ec04e82f9b. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c41e10e1-c329-4ce0-952c-ab2b4c5dd440.json and https://artists.proofprofile.net/proofs/artist/c41e10e1-c329-4ce0-952c-ab2b4c5dd440.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 0xafed15ad52b20e59144344dca444a4fd107a273e90489ced1792a6386e1719e0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/AR0982480007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f9af9ea97e88a89828645265c6efdacfa0b539fa296e9289441bca33fe914b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/UYG442100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78807ec8b6e2bbe125d05d93541d3f80c99b9a20ce3bd6f54ac501af6156c96e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UYG442000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5221403a8b926d0b5cc3edadfc9704fee7492da3ba0833ae9808179032d9c8d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UYB262000297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04053f1e283b40c7208afbe4894ba65f99d100596e16acaa2220df18f8f0bf3. 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/UYB262000298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300e4e0bb2c2457ca04971e12a2b7a61c67b2fe790a5444b8f1adde2b218b845. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/UYB262000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0827b818f39c34e306b32a9bce907985f07e05f3b2b147c11d8a1ba875ab46dc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UYB262000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800ee762092ac015ff2e9aa28f3339d1384b4aa46fbbba8a6ed16335b328f505. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/UYB262000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ffe13d9698072097861a0c4e18c4c0f701466e29f424f6c7e520325de10242. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UYB262000304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b612d5eb0fefcd945e1f6f560c9c3112d75a5e12206dcab529fd07ea3ee243. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/UYB262300000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c89cbbd2b7411f304a67d1180078485c333099b053dc89e1e573b08985fb366. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UYB262300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8f73d998c95665d178730feb42861cf9a0906f1bb7741f51c1a84d54f6ab83. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UYB262300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac1807d928408949833b3d0b6de1f6a017e5bd6f2083308f62e4460eec3e5b8. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/UYB262400134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10652f9bb3c29371c149daea81cca21be634eec8812d8aeefb49df53c9955ae8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/UYB262400135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc98f342b5fef8ae066859aff313ad8e19b74a38348b3140e42a3bcd9d2b634. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/UYB262400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418aba19fc9a551b25649cb5da23705512ac3d44b7223149b3edcdf1470cf5ab. 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/UYB262400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff9ee008a85c2b2376e889992a275ca082aebd3ca25d7500423c105cdccd13b. 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/UYB262400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccce75f31edd697cb79f4824f37c1b2a796580a74760cb62eb40428b8a2e4913. 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/UYB262400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b0d532aeb88370782af75410f7278cee878af7f91f927efbb986ff98a55e25. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/UYB262400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c4a749c5d2eeab6645a6d447496bed9ce98c16021d04f065b12b5243864f5a. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/UYB262400141.