Esquina is a word meaning "corner" in both Spanish and Portuguese languages. Clube da Esquina Esquina, Corrientes Esquina Department Esquinas, an orchestral composition by Silvestre Revueltas Catego
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 0x227ffa6251be729b7138932047363c80e74709d38bfc8e906e3fa8950d041593. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8f1b2b4-d971-4648-bba8-b0257b09b0b5.json and https://artists.proofprofile.net/proofs/artist/d8f1b2b4-d971-4648-bba8-b0257b09b0b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musiques du Rio de la Plata : Tango, Milonga (feat. César Stroscio, Claudio "Pino" Enriquez, Hubert Tissier)