61 may refer to: 61 (number), the natural number following 60 and preceding 62 one of the years 61 BC, AD 61, 1961, 2061 In some countries, a slang name for the Cyrillic letter Ы 61*, a 2001 Amer
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 0xd86e88b6590cbdb4724ffd80298f543e647b81c3279e4949d8427525d2f96f31. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ff3990e-d2a9-4dc2-baa5-07c7d9a2b747.json and https://artists.proofprofile.net/proofs/artist/6ff3990e-d2a9-4dc2-baa5-07c7d9a2b747.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).