Ichu is a municipality in the state of Bahia in the North-East region of Brazil. See also List of municipalities in Bahia References Category:Municipalities in Bahia
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 0x7616b22221294845dde9c1cc127b8d65df825c02d6ba2ed6c9d620aa63b9a888. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed13fa08-a199-48af-afdd-203cf53d1912.json and https://artists.proofprofile.net/proofs/artist/ed13fa08-a199-48af-afdd-203cf53d1912.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).