Dashu may refer to: Dashu (solar term) (大暑), the 12th solar term of the traditional Chinese lunisolar calendar Dashu District (大樹區), a district of Kaohsiung, Taiwan Townships in China Dashu Townshi
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 0x771aa53ab0dccada129f8d5967b1283d705ca6c0c48b4d69b1e82c6e23d66874. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e2b530b-da36-4d3f-bbd8-6aaf41bd2b37.json and https://artists.proofprofile.net/proofs/artist/4e2b530b-da36-4d3f-bbd8-6aaf41bd2b37.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).