thumb|180px|William S. MacPhail The MacPhail Center for Music is a community music school located in the Mill District of the Downtown East neighborhood of Minneapolis, Minnesota. One of the oldest 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 0xb2c91cb81959b43b3c3218e6ea79ccf0e9a2abb830d0aa81ae1f9360f6c24765. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59d5cd63-eaa6-4bfe-80d3-101350dc8974.json and https://artists.proofprofile.net/proofs/artist/59d5cd63-eaa6-4bfe-80d3-101350dc8974.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sing with Me: Early Childhood Music Favorites