Smak (; trans. The end time) is a Serbian (formerly Yugoslav) band formed in Kragujevac in 1971. The group reached the peak of popularity in the 1970s when it was one of the most notable acts of the [
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 0xc4391feb9a8133a790b4cb0d652b1d497a0eaa7701652fa90d93e51b37c589f1. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89bd4111-641d-4ae1-82ea-cf24d2da64ad.json and https://artists.proofprofile.net/proofs/artist/89bd4111-641d-4ae1-82ea-cf24d2da64ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).