The Miami Boys Choir (MBC) is a boys' choir specializing in Orthodox pop since 1977. History In the early 1970s while studying in yeshivah in Toronto, Canada, Yerachmiel Begun created, directed, an
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 0xc09a7208e8d605946286183249216fe9f406973f2f24232a7e51033ff7f282ca. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b73194b0-a61b-4a81-a345-bf0631c9e071.json and https://artists.proofprofile.net/proofs/artist/b73194b0-a61b-4a81-a345-bf0631c9e071.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).