Problemas () was a monthly political magazine published in Rio de Janeiro, Brazil. It was subtitled Revista Mensal de Cultura Política. The magazine was first published in August 1947. It was the offi
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 0x3193f9cc0483c7ad4b114c7b2107e61d091caa58a528d0e0331c341a3d35239b. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa072cdc-0a22-41f4-b3e6-28da8ca1fdbd.json and https://artists.proofprofile.net/proofs/artist/aa072cdc-0a22-41f4-b3e6-28da8ca1fdbd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Our Special Day [theme song from Our Special Day with Corinne Fisher and Krystyna Hutchinson]