D78 may refer to: D. 78, Aria "Son fra l’onde" for soprano and piano, composed by Franz Schubert in 1813 HMS Archer (D78), Long Island-class escort carrier built by the US in 1939–1940, operated by t
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 0x6bbe19346e1cf6d663bcdcc9073d24f3620a8df3e5e9bbce0c905b2e93b8bad2. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e52ac626-d01d-4ad2-b5b4-1b8cc1a0a374.json and https://artists.proofprofile.net/proofs/artist/e52ac626-d01d-4ad2-b5b4-1b8cc1a0a374.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).