Sophia de Mello Breyner Andresen (6 November 1919 – 2 July 2004) was a Portuguese poet and writer. Considered one of the most important Portuguese poets of the 20th century, she published fourteen poe
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42383d4c1f706f7446b4b39577847bb87d8e139eceee938bbca056431de493e5. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49be2038-98da-4713-b71a-b0563442a85a.json and https://artists.proofprofile.net/proofs/artist/49be2038-98da-4713-b71a-b0563442a85a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sophia de Mello Breyner Andresen & Jorge de Sena …Dizem os Poetas