"Sappy" is a song by the American rock band Nirvana, written by vocalist and guitarist, Kurt Cobain. It was first released as a hidden track on the AIDS-benefit compilation album, No Alternative, in O
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 0x3d97c6afb1035a38db7e9817b6f4832979711ae57db5207e17bc124eae1765f8. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7ea6ebc-15ae-4df7-b337-93bfa64f067f.json and https://artists.proofprofile.net/proofs/artist/c7ea6ebc-15ae-4df7-b337-93bfa64f067f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).