AC, A.C., A/C, or Ac most often refers to: Air conditioning, often abbreviated as A/C Alternating current, a type of electrical current in which the current repeatedly changes direction AC, A.C.,
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 0x755c72b200d7005c2bee59d0c4b308f1cff54339d66c905697aa4d7e924abb10. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9807c754-789b-462f-83bb-f8160fb9ad85.json and https://artists.proofprofile.net/proofs/artist/9807c754-789b-462f-83bb-f8160fb9ad85.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).