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 0xdf34f6ec5f5e1f82814b31d4e6cbeea502cbe69174c004fc627acc13e53a1414. 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/7898a0ea-db3a-46f4-ba8f-ef94ced8639e.json and https://artists.proofprofile.net/proofs/artist/7898a0ea-db3a-46f4-ba8f-ef94ced8639e.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 0xa166bdb32572cd8ebba577a655cea5c3dab293e630f9eab492e6918863115185. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZCKC1800057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586eb7da8f2d1f96aa9c3a20dd9ec30f3b65a4b5fda1b8f7a33341f201fd7b99. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN82070253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b03bbfb0e5d33c3c9aa8425ba8485655c15454eff13746251a9fc5089d2a1c2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZES82102556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f66a2732c6bcd5e634981490cc5e90d8882019ae2add2e7553749bbd364b852. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/UKW3Z2300732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c73384ddd2891bb8b9e86463211e8f6ac657a7aeedbe5a96bf9a20e00108f88. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMER2265663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d475127f97a84c9d14ccbad3fb569bf3e1bd5c4cf91b0ffe95a2ea1f919a6cf. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWZ2211960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1049690c10bd5d894865f838049c4c6dc3be952e40043aacb0dee528a8e83fe. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZGXC2500609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf564922d70d723396717d1ff19ccba19088ec7e71d15ea0bafb561f267517883. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZGXC2500436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1049690c10bd5d894865f838049c4c6dc3be952e40043aacb0dee528a8e83fe. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZGXC2500609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfffc79ad0377a083be8a2c10668e744e3bb038e136cc74f2d0408b983f4f90c. 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/QZGXC2401088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b83f60e641ee021c39a28fff75c887a1a6223545c9467a9686c956b68dfca3e. 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/QZGXC2500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4e70c9a78371652c98d395f1c525c9238e84929f55c95a39dc06a7b9e7a5f3. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZGXC2500679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e671950badae2b9ca8b4f769c3ec207850a6c2d3951615b150be8482a46f06. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZGXC2500893.