Nevermind is the second studio album and major label debut by American rock band Nirvana, released on September 24, 1991, by DGC Records. It was Nirvana's first release to feature drummer Dave Grohl.
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 0x2f12f2c08f65befc845908b6c6b461ae1cab0dc7396af610a12be4f469aa8f88. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c42cdfb0-294b-44ef-b5fd-bbbcd67b9954.json and https://artists.proofprofile.net/proofs/artist/c42cdfb0-294b-44ef-b5fd-bbbcd67b9954.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).