1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e55b4556243a8f7c8ea7cb0efd65f15c0fd85b240869ef011d6377d5e4af0e. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f15492ab-df91-4858-8d5d-57cdc71127f4.json and https://artists.proofprofile.net/proofs/artist/f15492ab-df91-4858-8d5d-57cdc71127f4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lk Bước Chân Trên Dãy Trường Sơn / Có Một Thời Như Thế
LK Hành Khúc Giải Phóng - Giải Phóng Miền Nam
LK Hãy Đến Với Con Người Việt Nam Tôi - Việt Nam Ơi!
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 → block OTSBitcoinBlock must exist at that height 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5bd310e4a8af3a409755bc6f47735e898c363694c3f1bd1831826c94850f14. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DGA0P2440434.
Liên Khúc Bước Chân Trên Dãy Trường Sơn/ Có Một Thời Như Thế
Liên Khúc Giờ Hành Động/ Tiến Về Sài Gòn