Hacı is the Turkish spelling of the title and epithet Hajji. It may refer to: People Hacı I Giray (died 1466), founder and the first ruler of the Crimean Khanate Hacı Ahmet ( 1566), purported Turki
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 0xdcce128e7340211832d5cec0e4953891830c070a37b6538b6cf575d744c0bb41. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a19c6eb3-3160-4c5f-918d-909c5c6a1024.json and https://artists.proofprofile.net/proofs/artist/a19c6eb3-3160-4c5f-918d-909c5c6a1024.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).