Marta Florença Casimiro dos Santos (born 25 December 1988, Luanda) is an Angolan handball player. She plays for the club Petro de Luanda and on the Angolan national team. She competed for the Angolan
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 0xc18a9a517f8c490126aefb1a4fd4f895b8449ae77f801dfb62bf4fa54b04f902. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.json and https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).