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 0xa9eb49fd36d0aed8c716dda2d57063fff6aebd706237dada3694a950d061d2d8. 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/c2b521cb-b2e1-4cfb-8018-cecd76b37c3e.json and https://artists.proofprofile.net/proofs/artist/c2b521cb-b2e1-4cfb-8018-cecd76b37c3e.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 0x013f6c6c580222539d7dedbcc4977246604ddb2cda19403e19af1346b443146a. 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/SE6XY2311051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4449364782412f5e38ac0f314b11825e1ff56f63a5fc1f23ea8a440d560bc8. 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/GBSMU5110678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f55517266863c8201fc4ca8ff13a3fb8ed0eef8c0e6e7b27f2a786cce79c16. 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/NOJKB2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b79752334ea00a5f5a3ef524249fbdd3350e749c121a9c5f53485774c227f02. 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/TCAEU2096871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8923ca488ef07542d615fc789f8fd9b6dca4923475cb807adc8826e16a3455d7. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/TCAET2002174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c692a39e9b3109aefe824fa702126726a594396ae1417e726c2dd3b15e538bf. 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/GBSMU7571115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dad39024d46c9712acacf702d30b3acfe1b4c949bd965c52c1ebdaa6d9389b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA42192068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0de737f90f8a56bc961bf5770fb87f53962f68bcdc5679d1a2f0bcf8be73fbe. 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/NL1AP2061552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4cfe7d9635c0123022f000f1a91dd57abb11b3accf989a7500ae1ef22ab554. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBSMU5904810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab629db7656c8a6731564f776da528eb969bf0ba03bef7c7d0b55e39a432490. 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/TCAEO1904627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214906eb7e1f8d0778ff6a5703d4869eeb248e8a220c7902fc350c1063582109. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEF1973993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb99b0052bdb87dc38a80a4f1eb1dfac0d8c1def3b0fecbf2659f0ed2ebce11f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBSMU7660826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadc96ab0179197b30d22f977444402c89415b4a6aa58300bb89d3b6883486ba. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TCAEE1953738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93be730354f987d1604c92a8dbd504ee782287d9a71d739ca39c48d26be669c8. 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/SE6I32023011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe527e1b9eee71c7ca8e696a26cb1d8ebbf309854265552865d427b89014211c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6A92002195.