147 may refer to: 147 (number), the natural number following 146 and preceding 148 AD 147, a year of the Julian calendar, in the second century 147 BC, a year of the pre-Julian Roman calendar 147
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 0xd37dd2aced9d6ccc47b0c517e62abf7e0eac86e13c3104778949aed59e12daec. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c5df919-6b5a-4423-8240-0e9bfe903990.json and https://artists.proofprofile.net/proofs/artist/3c5df919-6b5a-4423-8240-0e9bfe903990.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).