Foundation Devices, the Boston-based company behind the Passport Bitcoin hardware wallet, has raised $6.4 million in a round led by Fulgur Ventures with participation from Arche Capital. The funding brings Foundation’s total raise to $16.5 million and backs an expansion from Bitcoin self-custody into authorization infrastructure for autonomous AI agents, according to Bitcoin Magazine.
The centerpiece is Passport Prime, a hardware device that Foundation describes as the first “Human Authority Hardware.” It began shipping to pre-order customers in March 2026 and is now generally available at $349. The device combines a Bitcoin hardware wallet, FIDO authentication keys, two-factor authentication storage, a secrets vault, and 50GB of encrypted storage into a single unit designed to serve as a physical approval checkpoint for agent actions, as Crypto Briefing reported.
The Authorization Gap
The thesis is specific: as AI agents gain the ability to execute trades, manage portfolios, interact with DeFi protocols, and access enterprise systems, most agent frameworks focus on capability rather than constraint. Few define exactly what an agent is allowed to do and fewer give users a hardware-enforced kill switch.
Foundation CEO Zach Herbert told Bitcoin Magazine that the rise of AI agents creates a new form of key management challenge, arguing that authorization must move to independent hardware with a verifiable display and operating system rather than remain within software environments that can be compromised.
The argument tracks a real gap in the current agent ecosystem. Software-based permission prompts, browser notifications, and mobile confirmations all run in environments where an autonomous agent could theoretically manipulate or bypass the approval flow. Hardware isolation removes that vector.
KeyOS and the Developer Play
Passport Prime runs KeyOS, a Rust-based microkernel operating system that Foundation developed over three years. KeyOS is open source and includes QuantumLink, a communication layer using post-quantum cryptographic standards (ML-KEM) alongside ChaCha20-Poly1305 encryption on a dedicated Bluetooth chip.
Foundation is opening the KeyOS developer platform to external builders with an SDK, documentation, CLI tools, and a simulator for testing without physical hardware. The company plans to launch a KeyOS app store by the end of Q2 2026, targeting use cases including Bitcoin transaction policies, identity verification, enterprise signing, and agent approval workflows.
Cake Wallet is the first external team building on KeyOS, according to The Block, with additional integrations across Bitcoin, identity, and AI agent workflows planned through 2026.
Where This Fits
Foundation is positioning at the intersection of crypto security and AI governance, two domains that share the same underlying problem: authorizing actions in environments where trust is scarce. Most companies building at the agent-crypto intersection are focused on the agents themselves or on-chain execution rails. Foundation is targeting the layer between user intent and agent execution.
The $6.4 million round is modest by venture standards, but the bet is on timing. If autonomous agents gain meaningful traction in financial systems and a high-profile exploit forces the industry to take authorization seriously, the company that already ships hardware for it has a head start. The risk is equally clear: if agent adoption in crypto stays early-stage, the market for dedicated authorization hardware stays small.
CTO Ken Carpenter framed the platform as a shift from static key storage to programmable security, where applications execute policy within trusted hardware rather than relying on external software controls.