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 0xf50d15934ea0042e6017be3b3603208c27c1f8d4fa41e543798344b92333989a. 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/b3dbd2ab-5f9d-47f5-82d8-af884ab0fc5c.json and https://artists.proofprofile.net/proofs/artist/b3dbd2ab-5f9d-47f5-82d8-af884ab0fc5c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mật Đắng Tình Yêu - Mạnh Quỳnh Đặc Biệt 1
Hạnh phúc đơn sơ (Trường Vũ - Mạnh Quỳnh - Mạnh Đình)
Nhớ mầu hoa tím - Nhạc tình Bolero Mạnh Quỳnh & Mộng Thi
Như Giấc Chiêm Bao - Mạnh Quỳnh Bất Hủ 2
Tinh Music Platinum Series 07 - Xuân 2000
Tiếng Hát Để Đời 4 - Hoa Nở Một Lần Thôi
Tiếng Hát Để Đời 2 - 40 Tình Khúc - Hoài Linh - Châu Kỳ - Hoàng Phương - Vinh Sử
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 0x46669e3027b2a14bace8eb13760e676d1dd5ad305d7c9ed1b70aacfeee65d0ca. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USJ3V1425289 — a six-check JSON result.
Đam mê - Tuyệt Phẩm song ca - Phi Nhung Mạnh Quỳnh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2623b95982e153aa70e18214f912954ea3086e93cbd63689f0f9206462bb320d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA0F1704022 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffeefe15ec99d74720d4306b4bed9616d8a7bf70f1182c585b2159c71dd4b76. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA0F1704030 — a six-check JSON result.
LK Không Bao Giờ Quên Anh - Đừng Nói Xa Nhau
Liên Khúc Mùa Xuân Trên Cao - Mùa Xuân Đó Có Em - Cảm Ơn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053aa3980df30e8e7c091b416e3d12e46c7334e3331e26bfd5274b3b2e7b5a60. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA0M1841679 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5d1cdc6b9d5551a888633bee9e0cf4efbb27c2c94f57f5a95af91f972781ae. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62171209 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718dd5f5dc3037104159276a89ccc32a4f5b1931950b4a74c9df348d7f379b49. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62171221 — a six-check JSON result.
LK Người Đi Ngoài Phố - Qua Cơn Mê (Xuân Phát Tài 13)
LK Người Đi Ngoài Phố - Qua Cơn Mê (Beat, Xuân Phát Tài 13)
Mạnh Quỳnh 5 - Những Tình Khúc Tuổi Học Trò
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34eecf190c2e4f59ebc5699f475b0b447ea69fad695158f18639479b4ed592f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2091111 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2f67c4a4f82f874cb19ab60652b785260f972a901eed35f30ab7748924deba. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM48F0741413 — a six-check JSON result.