thumb|Don Solón Tello singing an icaro to a child in a traditional medicine ritual in the northern Amazon of Peru Icaro () is a South American indigenous and mestizo colloquialism for magic song. Toda
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 0xecf4e65c9e29dd3a219ee1fe9394ee92d398d8a07cc8f2082bdd3b78349a2af0. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30d2f1aa-c476-4e76-b4e0-27ea190b74d6.json and https://artists.proofprofile.net/proofs/artist/30d2f1aa-c476-4e76-b4e0-27ea190b74d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).