Tsu Surf (born Rahjon Cox; January 15, 1990) is an American rapper, songwriter, and legendary battle rap icon. He first gained attention within the battle rap scene during the pioneering stages of Ul
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 0x144ce47f259ede702bee21a38056b24d4927864208ac8446f1916d1e44abafcb. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/654482c1-b0ed-466e-8055-229656a2a3cc.json and https://artists.proofprofile.net/proofs/artist/654482c1-b0ed-466e-8055-229656a2a3cc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.