"Sleepyhead" is the debut single from American electronic band Passion Pit, featured on their first EP, Chunk of Change, and later on their debut album Manners. The single was released on September 8,
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 0x78094090c768253743596db5a3e4a06f5947e62f7b1c931ceba395346f675c38. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7ecd20f-9cbb-4405-8de6-ffeefc156907.json and https://artists.proofprofile.net/proofs/artist/f7ecd20f-9cbb-4405-8de6-ffeefc156907.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).