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 0xb2c3c29a7ab8cd5b371047bb86ff5bfbed22bec0236a820e3d32b1339dd43049. 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/6f6e8f43-5b5c-41d8-afef-8f5cbe510c4c.json and https://artists.proofprofile.net/proofs/artist/6f6e8f43-5b5c-41d8-afef-8f5cbe510c4c.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 0x86ce9e86d17defb6cf5bc42915b09a327d58b4c027335f403c6e0102bc756baa. 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/NLR7K1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ea7cda12ff58789faeed707360f9a8244fca1d13307d5f1d71e22da638f31a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/NL2CE1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc8366fb41c735af824d22f7d25d30c0c60aca643ad200347302fb601580448. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NL2CE1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3cc7e1ee5d41e51eb3f310ffd237410e337223c74d5f89c76f82e97c03e1fb. 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/GBKPL2158093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99edee7b0a577b12fb429c72a18d7c285c2e2cf05142fbc2da9b003f401a3dce. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:24:09Z), 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/QMDA62466628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a53b109ef5b3d693dc253e6257e2814a8de409fda50850f68fb7caa9fa7ac4e. 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/QMFME2445209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3cc7e1ee5d41e51eb3f310ffd237410e337223c74d5f89c76f82e97c03e1fb. 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/GBKPL2158093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b45f132328e5c5c8dffcdc95d4d1aec1e53efa93a06261e0e3f321516d4457. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QMBZ92453740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58fb7fe952103fde0e4f0f64fd80c4706787d37bea7a81254d5bf199586c9fa. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QMFMF2437383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eef10858cbe491b485b6f2971e13f1b0dafaa298a85e4729bfb4f852ee22d1c. 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/NLSB72000649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a5772a227753b5741707ffc6bb491bb51a6559f1f2ca04c7bf42051e4b5946. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:48:03Z), 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/GBKPL2142723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8261cceda84407c36c692ec35032cd1df94c1f298ab7087ff7894a0be6ec3319. 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/QMFMF2437386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99edee7b0a577b12fb429c72a18d7c285c2e2cf05142fbc2da9b003f401a3dce. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QMDA62466628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a53b109ef5b3d693dc253e6257e2814a8de409fda50850f68fb7caa9fa7ac4e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMFME2445209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4319306222478c02e49f6438aa36c01fc957a57e440dd6cb681f87a6316e5c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:36:37Z), 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/NL5CR2100002.