Fémina is an Argentine folk and fusion trio from San Martín de los Andes, Argentina. Career thumb|Fémina in 2019 at Rudolstadt-Festival, Germany In 2004, friends Clara Miglioli and Sofía "Toti" Tru
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 0x3011fa117c012b8f86a4129e2ab2cae9830effde933af8b00c5d2df37080780d. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e5b73e4a-35a8-4e8b-b619-e2975a7d0fde.json and https://artists.proofprofile.net/proofs/artist/e5b73e4a-35a8-4e8b-b619-e2975a7d0fde.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).