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 0x817638e4db2aca29ce5f1ddc231278b54f54b8e5a226596bd8d92855f99bb88d. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dba97f0f-c718-41b7-a289-f052de86d2de.json and https://artists.proofprofile.net/proofs/artist/dba97f0f-c718-41b7-a289-f052de86d2de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cổ Nhạc Continental Số 36 - Cánh Thiệp Hồng - Hai Chữ Yêng Hùng
Cổ Nhạc Continental Số 38 - Dạo Chơi Sài Gòn - Tìm Đâu Phút Ban Đầu
Cổ Nhạc Continental Số 37 - Ánh Sáng Đô Thành
Cổ Nhạc Continental Số 35 - Tôi Đi Lính Xác Pháo Nhà Ai
Cổ Nhạc Continental Số 11 - Tựa Tuồng Sân Khấu
Cổ Nhạc Continental Số 33 - Tình Thơ Mộng
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 0x06bb4722984a5d8b30be703d3f811cc5cc8eafe4ea77623df9bc9e919b8d94f1. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/VNA0F1706252.
Dĩa Hát Continental Cổ Nhạc - Sài Gòn Twist
Giọng Ca Văn Hường 5 (Tề Thiên Đại Thánh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10474706db0d5f3aea44c2b4e7e7b371e92e8c439c041af310a6c3903d3aa72a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/VNA0F1706310.