alt=Rexburg Children's Choir|thumb|upright=1.3|Rexburg Children's Choir The Rexburg Children's Choir is a community children's choir headquartered in Rexburg, Idaho. Founded as a 501(c)3 nonprofit org
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 0x004d5fe5a26fba956ad82a789341a5638c8f4bf23ec78d017ac20af891d6a493. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc0b799b-09c3-4c0c-b3c8-3811caf4da35.json and https://artists.proofprofile.net/proofs/artist/bc0b799b-09c3-4c0c-b3c8-3811caf4da35.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).