Saad or Sa'ad may refer to: Saad (letter), a letter in the Arabic script Saad (name), people carrying the name or surname Sa'ad, a kibbutz in the Negev desert in Israel Saad Esporte Clube, a Brazil
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 0xd98f1cde6fcb8df821310531434817d8ba50cdc1b38d14c28d0982750d2b2ba4. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d63b0f4-1547-47c7-9ac1-43c81e93c1b4.json and https://artists.proofprofile.net/proofs/artist/3d63b0f4-1547-47c7-9ac1-43c81e93c1b4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).