, also called (, literally "duck game"), is a game played on horseback that combines elements from polo and basketball. Since 1953 it has been the national sport of Argentina. History is Spanish fo
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 0x3b5f1ede846d08e03a8c6b519189c6a1beb574250592f51a6af7274b23f159c4. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2cbe4ec-8b98-4f3e-a600-af31b96bb611.json and https://artists.proofprofile.net/proofs/artist/c2cbe4ec-8b98-4f3e-a600-af31b96bb611.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).