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About Qbit
Qbit is a UTXO chain that uses post-quantum cryptography from its genesis block, built on Bitcoin Core code but run as an independent chain. It keeps proof of work and UTXO accounting, uses P2MR outputs that hide the public key until a coin is spent, and authorises spends with SLH-DSA (SPHINCS+ family) hash-based signatures of about 3.7 KB that do not rest on elliptic-curve assumptions. Blocks come from two lanes feeding the same most-work chain, permissionless SHA-256 mining and Bitcoin AuxPoW merge mining, with merge-mined blocks designed to make up roughly a fifth, borrowing existing ASIC and pool hashrate as backing.
Mainnet went live on 15 July 2026, with the genesis block hash and AuxPoW chain ID published. On 8 July the project open-sourced PRISM, a non-custodial mining pool: miners connect over Stratum, shares enter a single append-only ledger accounted in the TIDES style, larger payout sets settle through OP_CHECKTEMPLATEVERIFY fan-out transactions, the pool holds no spend key, and each coinbase anchors an audit commitment so miners can recompute the split. Official metrics break out difficulty, hashrate, mempool depth, lane mix and block spacing per mining lane; by late August 2026 the chain had passed 60,000 blocks.
Qbit launched its mainnet on July 15, 2026 with post-quantum signatures from the first output: P2MR hides spend conditions and SLH-DSA hash-based signatures replace elliptic-curve cryptography, while the UTXO model and proof-of-work consensus stay unchanged. Supply is capped at 210 million QBT with no premine and no outside allocation, all issued through permissionless SHA-256 mining and Bitcoin AuxPoW merge mining.
The first emission step-down hit block 43,200 on August 14, cutting Qbit's subsidy 4.32% from 210 to 200.92 QBT; by block 61,607, 12.77 million QBT was circulating, or 6.08% of the cap. On July 8 Qbit open-sourced PRISM, a non-custodial Stratum pool that pays miners directly from coinbase and settles large payout sets with CTV fanouts.
Qbit's issuance steps down 4.32% every 43,200 blocks toward the 210 million cap, with the next cut to 192.24 QBT at block 86,400. The team plans to keep expanding AuxPoW merge-mined pools and ASIC access, and to open-source more of its node, mining and monitoring tooling.