Maria do Ceo (1658–1753), was a Portuguese poet, writer, and playwright. She went by the pseudonyms of Marina Clemencia, Sister Maria do Cêu, Sor Maria do Ceo del Cielo and Maria del Cielo. (11 Septe
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 0xb09d36f5e8e0244c3138d6c446f56b5125c4c006ae3adb46c9ad4d10a9137ab4. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcefab3f-616f-484a-a664-20791996b562.json and https://artists.proofprofile.net/proofs/artist/fcefab3f-616f-484a-a664-20791996b562.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).