Maria João may refer to: Maria João (singer) (born 1956), Portuguese singer Maria João (model) (born 1955), Brazilian model Maria João Abreu (1964–2021), Portuguese actress Maria João Bastos (born
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 0xcf64afa219b83c5b3a02ad562cc0f22ea3a2d2c397aefd5dd600ceb5cdb55f0c. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e335ea7-b0b3-418c-99d4-b9a92a499d1a.json and https://artists.proofprofile.net/proofs/artist/1e335ea7-b0b3-418c-99d4-b9a92a499d1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).