Pro is an abbreviation meaning "professional". Pro, PRO or variants thereof might also refer to: People Miguel Pro (1891–1927), Mexican priest Pro Hart (1928–2006), Australian painter Mlungisi
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 0x024c514a0e2e7c52280fb34cdfe458bd80f0f62c29037e4e0ac91c0ad47634a1. Chain 2 (Bitcoin): anchored in block 953980 (2026-06-16T17:16:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c9aca0a-1a29-4179-9910-aa12e346b7a8.json and https://artists.proofprofile.net/proofs/artist/2c9aca0a-1a29-4179-9910-aa12e346b7a8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).