Ṣumūd (, meaning "steadfastness"Abed, 1988, p. 288. or "steadfast perseverance"; derived from the verb ṣamada, meaning "to defy, brave, withstand") is a Palestinian cultural value, ideological theme
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 0x3b3e0056ac00b9895c68285d04a8309492f895ad388b4056faf87123885d7757. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80d28d95-1b3b-43d5-a344-457bc0cef839.json and https://artists.proofprofile.net/proofs/artist/80d28d95-1b3b-43d5-a344-457bc0cef839.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).