// GLOSSARY -- BLOCKCHAIN & CRYPTO FUNDAMENTALS

What is Self-Custody?

1 min read Updated

Self-custody is the practice of holding and managing your own cryptocurrency private keys, maintaining direct, exclusive control over your digital assets without relying on any third-party custodian.

WHY IT MATTERS

Self-custody is the philosophical foundation of crypto. 'Be your own bank' means no intermediary can freeze, seize, or lose your funds. You bear full responsibility — and full control.

The tradeoff is operational complexity. Key management, backup procedures, and security become your responsibility. For organizations running agent fleets, this means infrastructure for secure key storage, access controls, and disaster recovery.

The challenge for AI agents is reconciling self-custody with autonomous operation. How do you maintain self-custody when an agent needs signing authority? The answer: smart contract wallets, session keys, and policy layers that give agents constrained access without surrendering full key control.

HOW POLICYLAYER USES THIS

PolicyLayer preserves self-custody while adding spending controls. Your keys never leave your infrastructure. PolicyLayer enforces rules through smart contracts and policy validation — you maintain full custody while agents operate within defined boundaries.

FREQUENTLY ASKED QUESTIONS

Can I self-custody with AI agents?
Yes. Use session keys or smart account modules that give agents limited signing authority within policy constraints. You retain the master key while agents get scoped access.
What happens if I lose my self-custody keys?
The funds are lost permanently. This is why seed phrase backup, hardware wallet usage, and potentially social recovery mechanisms (via smart accounts) are essential for self-custody.
Is self-custody required for using PolicyLayer?
PolicyLayer is designed for self-custody setups but can also work with MPC wallets and other key management solutions. The principle is the same: you control the keys, PolicyLayer controls the spending rules.

FURTHER READING

Enforce policies on every tool call

Intercept is the open-source MCP proxy that enforces YAML policies on AI agent tool calls. No code changes needed.

npx -y @policylayer/intercept
github.com/policylayer/intercept →
// GET IN TOUCH

Have a question or want to learn more? Send us a message.

Message sent.

We'll get back to you soon.