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 0x07864bb44ca17e96a727beaef9f049d757e038a010eb2e9fd872e3589a9f855d. 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/1dca01e3-1b89-4a23-af1d-6d8a5cd619a5.json and https://artists.proofprofile.net/proofs/artist/1dca01e3-1b89-4a23-af1d-6d8a5cd619a5.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 0x547e07e9d8c3b9a6119022d125185d6840ce3cf599cdd41facb36900dbda8b22. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZGCD1800458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7f1c724afa19517e71201a869e92417500410b11607401c74c968ee9224437. 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/QZGCD1803444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690bfd2e6e275a8d6e59c40d86eb09abc030b46bfe8c20d8f6757b63cdccb870. 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/QZGCD1803451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf841455f65ca9cd809ab2730dc24457056ad0b1943312c4f6078582fe61b6c04. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZGCD1803455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3958b0c3c04e7a6568f78a678665d503fe53dbd1f225aeba2dba92365daf327f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZGCD1803457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb4cec0c08a783bccc3dc42e3054ec359f2e1eda9b495ed2554f93f6f3b5f04. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZGCD1803578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898ab506395700a268973bccf39a4c8917f169dbcdb3e8307def5db8cb81eb41. 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/QZGCD1804200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501be46e07af2c92bbd59dda3781a5888ae7afb4d91f71f3d208199e3edc7547. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZGCD1804203.
Liên Khúc Mùa Xuân Của Mẹ - Rước Xuân Về Nhà
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27ed6ac8b4e6ab9dfb342d8a43344c4cfbb5030b80085916c9684f151219a37. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGCD1808379.
Nhật Trường - Trần Thiện Thanh 2 (ASIA 61)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d234181285396c2281086637e26991da84016de07ea5294b3c23d42abd81e6. 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/QZGCD1806325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3ba79600fe6735994b1d72733196f550a2bf48851685e59980a9e6edec9f79. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZGCD1806269.
Lá thư từ chiến trường 2: Cánh hoa thời loạn (ASIA 66)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133676af5c21aae82a3fdcbc05dad5ed4286819c28fa1a78b600a4884c0ec2cd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGCD1806198.
Trúc Phương - Ông Hoàng Của Dòng Nhạc Bolero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60075b69856f4d75ab855d65c4fca8bae37b0bbd0140fe810a69b7600b327c64. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGCD1806011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb61a3b35e930eba32978ce758d7b25dd083e93eca2c1397afebff37f5bd2d4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGCD1806026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44195cae9837abf668a12008a1d66774a22a5569672001ca79491e71fb9e1891. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZGCD1808403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ff8b6cd47e3eed0329496e726bf6a5a33a4c026b07409c00227d52bab9daad. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGCD1804650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc222724938a30ea3269b566a75c888f6d256c1534b3e65813fe27c78705048. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZGCD1804651.
Saigon Nostalgia - Sài Gòn kỷ niệm (ASIA 68)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21afc5cde275c0d75ec2eff734a86e6fb9c319c08ea83b3aacf437bfd4f276ca. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZGCD1806153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642345dc7ca6cc544d4a7f90f707664c0e5b665a9e22a4a081b2cc20fb7c7081. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZGCD1800548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead1eb8341ea76ccf7bd66693bc5edd93f4e7fecbcca7fcc091953498c853f5d. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZGCD1806180.