Planet B 21 operates SHA-256 compute capacity and advises on Bitcoin custody architecture, signing schemes, and mining-network security. Built on deep operational experience, delivered through modern payment rails and clear engagements.
The Bitcoin ecosystem is moving from early-adopter experimentation into critical infrastructure that families, businesses, and operators depend on. The gap between that reality and the operational maturity of most services in the space is where we focus. We build and advise with the same discipline you would expect from any regulated financial-infrastructure company.
We work in three narrow, related domains — SHA-256 compute, Bitcoin custody architecture, and mining-network security — where operational depth matters more than surface area.
We work with regulated payment providers and established banking counterparties. Every upstream relationship is KYB-onboarded under a single legal entity. Nothing is routed through shells.
Whether it's our own hashrate operation or a client engagement, the same security posture applies: non-custodial where possible, least-privilege always, documented and reviewable in practice.
Each service is delivered by Planet B 21 directly. Engagements are scoped, priced, and documented in writing. Hashrate is available through self-serve channels; consulting practices engage by inquiry.
Purchase contracted SHA-256 compute capacity in standard units (TH/s, PH/s, EH/s) with mining rewards routed directly to a pool account you control. We are not in the custody path — you provide the pool identifier, the upstream provider delivers the hashrate, the rewards flow to you.
For retail customers, our consumer brand Cash to Hash (cashtoha.sh) offers smaller allocations and fiat-native checkout. For larger orders, capacity is arranged directly with Planet B 21.
Holding Bitcoin at scale is a discipline. The choices that look small early — key generation environment, quorum structure, recovery path, signing device policy, ceremony documentation — determine whether your position is actually safe a decade from now. We advise individuals, companies, and treasuries on designing, implementing, and operating those systems.
Every engagement starts with a threat model specific to your situation. We are vendor-neutral on hardware and software; our job is to match the architecture to the actual adversaries you face, not to sell you a product.
A mining datacenter is not a generic enterprise network. Its threat model includes pool account takeover, firmware-level compromise of fleet ASICs, hashrate redirection, stratum interception, operational-technology disruption, and insiders with physical access to the floor. Generic security advice — even good generic advice — does not cover it.
We advise operators, datacenter owners, and hosting providers on the specific security posture their environments require, drawing on direct experience running and securing mining infrastructure at scale.
Tell us what you're working on. We'll respond with a scope and whether we're the right fit — or point you somewhere better if we're not.