Tonus is the Latin equivalent of the English word tone, and may refer to: Muscle tone, the continuous and passive partial contraction of the muscles Arterial tone, the continuous and passive partia
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 0xb7f60c4c38536cd9ae95b48572744416a8f483d2ca71b1aa0494c79b21f397e5. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35b47636-55c1-463a-9d54-f23d89b2d010.json and https://artists.proofprofile.net/proofs/artist/35b47636-55c1-463a-9d54-f23d89b2d010.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).