Audio most commonly refers to sound, as it is transmitted in signal form. It may also refer to: Sound Audio signal, an electrical representation of sound Audio frequency, a frequency in the audio spe
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 0x0c4d8050e29af1d8b310459054e31e33b0ef0edae6c5da35a30919f289b9a89a. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c96a6525-8517-4555-9fa2-de92eff091e0.json and https://artists.proofprofile.net/proofs/artist/c96a6525-8517-4555-9fa2-de92eff091e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).