Ashar (Modern Turkish: Öşür or Aşar) was a tax in the Ottoman Empire, based on the traditional practice of muqasama (which means "sharing"), a traditional tithe in the Fertile Crescent. It was abolish
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 0x39ddc7cc2ac6cf5361950a452b5290f33278ecfcec3abe4a73fbc83fb28df72d. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f93821fb-815b-4c07-9060-0c203675d911.json and https://artists.proofprofile.net/proofs/artist/f93821fb-815b-4c07-9060-0c203675d911.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).