El Sie7e was a Colombian band. History The El Sie7e history goes back to 2001 when four Colombians put their act together in Bogotá. In 2003, after touring Colombia and Ecuador, the band was included
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 0x69c3d0933c24f0c9ad02c18145f67bdb455eed3193e52e585a47fd466e16b5f7. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d2d1c9f-9f8c-4695-b535-e31bf4603709.json and https://artists.proofprofile.net/proofs/artist/2d2d1c9f-9f8c-4695-b535-e31bf4603709.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).