Rivaldo Vítor Borba Ferreira (; born 19 April 1972), known simply as Rivaldo, is a Brazilian former footballer who played mainly as a second striker but also as a attacking midfielder, and on occasion
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8127912c9ad5f799967cb7cc0b9d71dd4a5d828fdb1dd436cc7e98f62b4a0748. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1010b236-14a0-4656-b702-ebfbdaed49c2.json and https://artists.proofprofile.net/proofs/artist/1010b236-14a0-4656-b702-ebfbdaed49c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).