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 0x3b6b98721ae4fd3c42eb7a130a10d4e1e94d2f25cf640ad8ad525a10f2cccd30. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cdb332ae-f073-462f-a41c-fc74e362b884.json and https://artists.proofprofile.net/proofs/artist/cdb332ae-f073-462f-a41c-fc74e362b884.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
LK Buồn Làm Chi Em Ơi, Sao Lòng Còn Thương
LK Sao Lòng Còn Thương, Ngày Tết Ba Miền
LK Tình Thắm Duyên Quê, Em Không Muốn Ra Đi
LK Đường Tím Bằng Lăng, Tình Thắm Duyên Quê
LK Ước Nguyện Đầu Xuân, Đường Tím Bằng Lăng
LK Đắp Mộ Cho Chàng, Tán Thán Cõi Phật A Di Đà
LK Tán Thán Cõi Phật A Di Đà, Ước Nguyện Đầu Xuân
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 0xf5d8fedc8db3b50389919353b43cea0c1e43e5884b645c84fb488b0afc9200ac. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DGA0P2475954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61f27a485bc475942068cd72ac26d760492defbd62d986cc339ffc739029f8d. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:18:51Z), 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/DGA0P2475516.