Hard Head (stylized as HAP.D HEAD), originally known in Korea as Dr. Bulgehead (), is an obscure 2D side-scrolling arcade platform game developed and published by SunA Electronics of an unknown team 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 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 0xc930dcc5f3f02e97d5d900f06c8eb4a064313d8c2ee8e2f7365f88ef9567851b. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09748eac-9ca8-4d41-a933-fa7b0dec9bbf.json and https://artists.proofprofile.net/proofs/artist/09748eac-9ca8-4d41-a933-fa7b0dec9bbf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Back Up Off Me (feat. 40 Glocc & 2Face) - Single
OL G. Bossin (feat. Tony B., Joe Nash, Ms. Switcha)
Heroin (feat. Killa & Curtis Young) - Single
Ninety Three (feat. B.G. Knocc Out, Loesta & Clinton Wayne) - Single
Red Cup's (feat. JE & L Double) - Single
What You Want, Anything? (feat. Tru Verse, Winsday)
That's the Devil (feat. Winsday & JE) - Single
Making It Hot (feat. Rich Loco) - Single
Ride for the Money (feat. Killa) - Single
I Found U (feat. Lazy Bone & Deacon) - Single
You Know We Be On (feat. Razor Ant & Killa)
So Good (feat. Brihtani Lee Shay & Sir Loon)
I Like That (feat. Killa, Jelly Roll, Hash & Savii Cross)
Boss Is Bacc (feat. Tiago, Killa & Hash)
IDGAF (feat. Royalti, Killa & Saggzilla)
Whatever (feat. Stu Cheba, Sir Loon & Minnie)
What You Gonna Do with My Loving (feat. Takii, Big Ta Da & Boom Bam)
Real with Us (feat. Tiago, Killa & Kebo)
Get That Doe (feat. Krissean, Sir Loon & J.E.)
Ware the Weed @ (feat. Jelly Roll, Worse & Hash)
Where The Real (feat. Mz. Mistress & King Scratch)
Money, Sex, Car's (feat. This Jay & Holiday Ray)