thumb|right|240px|First torre de nou amb folre carregada in history, Castellers de Vilafranca thumb|right|240px|First tres de deu amb folre i manilles carregat in history, Castellers de Vilafranca thu
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 0x938f266185098ab775ba0b1c13af88a090903799305d8ae4ea591dd3da2aaea0. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28cb07c3-8c7a-41cb-b806-6eaed6840a82.json and https://artists.proofprofile.net/proofs/artist/28cb07c3-8c7a-41cb-b806-6eaed6840a82.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Amunt Verds! Himne dels Castellers de Vilafranca
Amunt Verds! (Dj. Morrison & Kave Remix)
L'OMAC i els Castellers de Vilafranca al Liceu: música, castells i tradició