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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e57aa362e644e142f4acd053c902595ea2124d6b580af3195141377bea1664. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3288aaf2-c804-4e02-a2c1-a797e01ddecc.json and https://artists.proofprofile.net/proofs/artist/3288aaf2-c804-4e02-a2c1-a797e01ddecc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nguyễn Hải Phong - Nhạc Vinahouse, Vol. 1 (Metaplay Vinahouse)
Nguyễn Hải Phong - Nhạc Deephouse, Vol. 1 (Metaplay Deephouse)
Nguyễn Hải Phong - Nhạc Lofi, Vol. 1 (Metaplay Lofi)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd539b72177dc9e6c4f77c8ac83ab21caafc9dcf04a1a9c3b5d48f63db73338b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ7782203434.
Tuyển Tập Các Ca Khúc Pop Và Acoustic Của Nguyễn Hải Phong, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f502a525e4bbbff2f9cb3f6726172c16f05533481d4ac59bdd5da7efef0f5d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZ7782203433.