The Sufis is one of the best known books on Sufism by the writer Idries Shah. First published in 1964 with an introduction by Robert Graves, it introduced Sufi ideas to the West in a format acceptable
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 0x896ac17916b260cecee452145f145f7b174b78c45796c46b61213292cdf1ec8c. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23791bc5-d656-48ad-935a-c940bdfe96be.json and https://artists.proofprofile.net/proofs/artist/23791bc5-d656-48ad-935a-c940bdfe96be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).