Roc, roc, ROC, or R.O.C. may refer to: People Roch (c. 1348 – 1376), Occitan saint called Roc in Catalan Agustí Roc (born 1971), Spanish ski mountaineer Margaret Roc (born 1945), Australian author
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 0xe405c4e0ef50fe1d8430b4113652fb893946ff2f76198512419d856842314eb0. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d281153-ad74-4a11-878a-4effa0e9d2f6.json and https://artists.proofprofile.net/proofs/artist/2d281153-ad74-4a11-878a-4effa0e9d2f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).