AA, Aa, Double A, or Double-A may refer to: Arts, entertainment and media America's Army, a 2002 computer game published by the U.S. Army Ancient Anguish, a computer game in existence since 1992
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 0x63848c042b492be0850d545e49ef96f621dcbd84e02467a8d9e2515628159087. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ad6f42b-43dc-485c-a64f-5d9c042e88a1.json and https://artists.proofprofile.net/proofs/artist/6ad6f42b-43dc-485c-a64f-5d9c042e88a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).