Sandrina Buenatelue António (born 5 October 1997), known as Sandrinha, is an Angolan footballer who plays as a goalkeeper for GD Sagrada Esperança and the Angola women's national team. Club career Sa
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 0xe3a699afca4a191b783fc8cb8918b7bf082adc01d3d1f9c03fac91bd38aa9b6f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5611a626-11a7-4270-9731-b84e0c09d8c0.json and https://artists.proofprofile.net/proofs/artist/5611a626-11a7-4270-9731-b84e0c09d8c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).