Sabr () (literally 'endurance' or more accurately 'perseverance' and 'persistence'"Ṣabr", Encyclopaedia of Islam) is one of the two parts of faith (the other being shukr) in Islam."Shukr", Encyclopae
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 0x39f05ea220dd5c2fc2696c9cf61d9b6d02e85ccfc8eee17f0ab117d1fffe3367. Chain 2 (Bitcoin): anchored in block 953975 (2026-06-16T16:53:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b99f526-1965-4c68-9af4-fec06cbdd516.json and https://artists.proofprofile.net/proofs/artist/2b99f526-1965-4c68-9af4-fec06cbdd516.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).