Old School Bitcoin
One CPU, one vote.
OSBTC is a fork of Bitcoin Core with Bitcoin's original 2009 emission and a CPU-friendly proof of work, so ordinary computers can mine it.
Status: private testnet. There is no public network, no coins for sale, and no launch date yet.
Numbers
| Max supply | 21,000,000 OSBTC |
| Block reward | 50 OSBTC, halving every 210,000 blocks |
| Block time | 10 minutes |
| Difficulty retarget | Every 2 weeks, as Bitcoin |
| Coinbase maturity | 100 blocks |
| Premine | None |
Proof of work: OSHash-Y
Header → SHA-256d → yespower (2 MiB memory) → SHA3-256 → compared to the target. The memory-hard step favours CPUs over ASICs.
Genesis
Old School Bitcoin 28/Sep/2026 One CPU, one vote