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 0x09efa125d0b8de69e316df1140791f3cc12031ca26eb11ab54c3fecd818f40b5. 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/4b640586-7023-46f6-b08e-0eb78c346536.json and https://artists.proofprofile.net/proofs/artist/4b640586-7023-46f6-b08e-0eb78c346536.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 0xdabd4c4667494080d82839aedc264c44dd2d2a15d38dde278b063c351c3e1614. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/DECY52000800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc75e480e58f870ecab2597ff9f2f417845502b2690f61d078672c00458887e. 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/DECY52100478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4ae46bcc41bb5d25b421db92cce39eeb3b3da72fdf72b3d624172811eb7c63. 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/DECY52200423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0253b87a283a1805fabf086f1fb51180b3362d3bc8fb1c8126f98d5715ba697f. 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/NLCK42213233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6a9effe7d8cddb632e0d60729d87e29ec78387c44cfe57650000aac2c2cc01. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GBKQU2311694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9eb7b9bcf4c80f896a147d58a370eca05ee73ca19705c2a2aae1d7f601505f. 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/NLCK42231007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ff59b8e2fe3530f6fd8548c38e7dcd32263633099453ff92578ad83350bc24. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLCK42403076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff54fae163d732df5eebb6fb4921526b6b125214e3323ae7c33ec6c96d9ae9c. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/NLCK42403079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdd0efbfb9cdac395f894404c2a863f4d3dfd42bd461496b3258ba4714f2904. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/NLCK42415324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350dd34977f32fd927e8a9c5376e438196c168af32ff6243ffefeab4349003e5. 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/DEH742437863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bc2bb6cf62c1d20a0a28d8d1fdbad664e31c677b6b4284d3b8722bdbd95e8d. 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/DEH742437866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7822cbcf46cc1cff14f180bbd9df30f3e237733af375aa3bc3ef1633645b71. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEH742311989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1880c292434e143b7580dbd1f992049167099a81ff41dc09cf9232e7d6603a. 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/NLC8K1400375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf407f4d3ccdf2e9b5f3e060073cdb95bbd04f0ac2f3013fd90e3f7898d1eed7. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLCK42210393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6251a6fd2d3c67fb5d0e0367b7f5b08fed83a22eb292471f5bba345a9a4bd86. 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/NLCK42210394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe899307e13b86c067b5dfff3bdcf614ad4a11e9a9d1bd1eb1cd1a5a4000aa3db. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/BEC292447041.