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 0x1afe9f248aa9e44109bbd2bc5b83e918fed12f5f938512ce771090b4ff850e2b. 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/f6e83589-250c-4e6f-bde4-bfc016693d81.json and https://artists.proofprofile.net/proofs/artist/f6e83589-250c-4e6f-bde4-bfc016693d81.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 0x2e1a12b5870b44876ae68c54d968ac919ae4b7127892b334b23ed6d85d2ee715. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM4TW2082529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e2537e00f2be871b478f8c99d193ee24b200b654256355214e5d9ae3f197a8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T14:01:01Z), 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/QM4TW2082531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79abda2eabe6e2254e6a45b655956dcd68c6bf5dbd74ceb6847c4cb3274d2fbd. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:07:28Z), 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/QZGCD1805223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50590346387464d84373cbde4383273d61091511a279ce004cecee14b7d33e17. 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/QZGCD1805225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4039ebe8dcd1969c9c202bfebf5c00ca177b40ca31c41a0a5025c17bd0945499. 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/USCGJ1924215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec7a59451e37805de5adf8d7b3780ad43d91d4b737e780256fccb4202ca5ef8. 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/USCGJ1924219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a52a3cb97aa8e2e2e93751bc54b9b82ca069c66b03922d8e7a42577c69bc743. 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/QZGCD1805382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ee520a99a865c45ebe963573eb5bb5dcea6507e2218faf963eaee445f36b2e. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZGCD1805385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bb7c918b5dd14e046abc46b6f4112cd7653021ccd8bed711611138d0383a24. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZGCD1805387.
Hoa Tau Dan Tranh - Dong Nhac Anh Bang - Truc Ho
Hoa Tau Dan Tranh So 2 - Dong Nhac Tran Thien Thanh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5979a1c7c2f5bf2b1f702fea28699b2bc4bdd50f3f032c12508f3a1d2955039e. 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/QZGCD1803336.