Dalu or DALU may refer to: Places China Dalu, Anhui (大路乡), Lingbi County, Anhui Dalu, Heilongjiang (大陆街道), in Nanshan District, Hegang, Heilongjiang Dalu (大路乡), a township, Tongshan County, Hubei
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 0x9cba407079e5e6430280b448ef7f1f8d312d83a7afcff3170e0d22bc485d55a8. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e98a9457-04de-45d4-8af1-57e25923aa3f.json and https://artists.proofprofile.net/proofs/artist/e98a9457-04de-45d4-8af1-57e25923aa3f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).