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 0x7e74596f5981c40863f8390f88a9f6763b90b667da1064a29d7eba3d8a06f047. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e3651a4-6fec-4891-b03c-c7442ab327e5.json and https://artists.proofprofile.net/proofs/artist/3e3651a4-6fec-4891-b03c-c7442ab327e5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Pessoa (Tomo V "Go to make existence' hell")
Pessoa (Tomo VI"Thou dost say that too soon we grow old")
Pessoa (Tomo X "Play on with that music all lonely")
Pessoa (Tomo I "Conta a lenda que dormia uma princesa encantada")
Her fingers toyed absently with her rings
Pessoa (Tomo XVII "The bad, indeed, is better than the unknown")