"Tu Sancho" is a song by American regional Mexican band Fuerza Regida, released on May 2, 2025 from their ninth studio album 111xpantia. It contains a vocal sample of "Don't Say a Word" by Ellie Gould
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 0xbcfb98a14c5013e19530a97918c4e4b8bf9b4da6baca8bb1f9beb8c6aff22b60. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15ff7387-8960-426a-9a09-1ce358d8e5e8.json and https://artists.proofprofile.net/proofs/artist/15ff7387-8960-426a-9a09-1ce358d8e5e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).