Chalga (), often referred to as pop-folk or ethno-pop,Стателова, Розмари. (2003) Седемте гряха на чалгата. София: "Просвета — София" АД, Димов, Венцислав. (2001) Етнопоп бумът. София: "Българско музик
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 0xa487ff0d4e129e2b8197a12df0632ca32d145f2e80e940af08f40a1f69d221ee. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a182a6c4-41e6-4480-82f0-a0e49f527938.json and https://artists.proofprofile.net/proofs/artist/a182a6c4-41e6-4480-82f0-a0e49f527938.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).