Dasilva or DaSilva is a surname. Notable people with the surname include: Dan DaSilva (born 1985), Canadian ice hockey player Edgar J DaSilva (1941–2007), Indian microbiologist Jason DaSilva (born 1
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 0x0c38f36de494286c2fbd2f615f97d16f9e97d489ff842b091e89b5484099b8a1. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f5b42a1-805f-4cca-968b-bf263b112ff7.json and https://artists.proofprofile.net/proofs/artist/4f5b42a1-805f-4cca-968b-bf263b112ff7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).