Mario Gareña, stage name of Jesús Arturo García Peña (25 September 1932 – 25 August 2021) was a Colombian singer and composer. He was one of the most prolific singers of cumbia music and was known for
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 0x857eccc980ffaf7e5d7063dbda02aba63f3b05365d6f1ac737a1da111b3ace85. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4f788bc-38c7-4017-828a-9b94892b89a6.json and https://artists.proofprofile.net/proofs/artist/b4f788bc-38c7-4017-828a-9b94892b89a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).