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Why an AI agent should not hold your recovery phrase
ADA is recorded on the Cardano blockchain; a wallet manages the keys that let you authorize actions involving it. A recovery phrase can regenerate the wallet’s key tree. Anyone who obtains that phrase may be able to control the funds, so treat it like a master credential—not as ordinary text to share with software.
Cardano’s Keys & Wallets documentation describes how AI agents can use SDKs to hold keys, build transactions, sign them, and submit them. That is a capability, not a claim that every agent does so or that any particular framework is secure. An agent with access to keys or a signing mechanism should be treated as privileged software, not as a vault.
- Never enter a recovery phrase or private key in an AI prompt, chatbot, website, support conversation, tool configuration, or agent-accessible file.
- Do not store recovery material in screenshots, cloud-synced notes, or folders the agent or its connected computer can read.
- Cardano’s seed-phrase glossary notes paper and stamped metal as possible storage media. These are storage formats, not guarantees: protect physical backups from theft, loss, and discovery. Cardano also says a legitimate support agent will not ask for your recovery phrase.
Choose an access model that fits the task
The key question is whether the agent-connected host can reach signing keys, and whether a person must inspect and approve each transaction. More automation can be convenient, but it also gives software more authority to act.
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| Approach | Can the agent-connected host access private keys? | Human review | Practical fit |
|---|---|---|---|
| Software wallet access | It depends on how the wallet and agent are configured. Do not assume a software-only setup isolates keys from the host. | Approval depends on the wallet workflow; inspect each requested action. | Convenient, but key exposure or excessive permissions can have serious consequences. |
| Hardware-backed signing | Keys remain on the secure device, according to Cardano’s keys and wallets guidance. | Review transaction details on the device before approving. | Useful when an agent prepares transactions but should not have independent signing authority. |
| Offline or cold-key workflow | The signing keys are kept offline rather than available to the agent-connected host. | A person moves or reviews transaction data and signs through the protected workflow. | Appropriate for holdings that do not need frequent agent-assisted transactions; less convenient for routine use. |
Cardano’s documentation recommends checking transaction details on the hardware-wallet screen, not just in the app. It describes the hardware-wallet category, but does not rank products or establish current compatibility for particular models; verify compatibility before relying on a device in your setup.
Separate wallet connection from transaction approval
Connecting a wallet is not the same as authorizing a transaction. Cardano’s wallet connection guide describes the browser-wallet interface, CIP-30: a dApp can request access to wallet information such as addresses or UTXOs, and it may request a transaction signature. Grant only the access needed for the task, and treat a signature request as a separate decision.
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Not every signature has the same effect. Cardano’s wallet authentication guide distinguishes signing a nonce to authenticate a user from signing a transaction. A transaction signature can authorize an on-chain action; do not approve one simply because a tool labels it a “login” or “verification.” Check what the wallet is asking you to sign.
Use a safer workflow for agent-generated transactions
- Keep primary recovery material away from the agent. Use an offline backup or hardware-backed signing for a primary wallet, particularly when it holds funds you cannot afford to lose.
- Limit the agent’s role. Prefer read access or transaction drafting when that is sufficient. Do not give broad permissions or unrestricted signing authority just to make a task more convenient.
- Use a separate wallet for experimentation. As a prudent operational practice, keep only task-appropriate funds in a wallet used with agent workflows. The amount is your risk decision; Cardano’s cited guidance does not prescribe an allowance or wallet structure.
- Inspect the proposed action. Before signing, check the recipient, amount, fees, and any script or contract action. If those details are unclear or differ from what you intended, do not approve.
- Verify on the trusted signing device. Confirm the transaction details on the hardware wallet’s own screen rather than relying only on the agent’s description or the connected app.
- Submit only after review. If the workflow lets an agent submit transactions, remember that signing and submission are distinct steps. Do not allow automation to bypass the approval boundary you intended to keep.
Account for local APIs and connected computers
A local wallet API is still a sensitive trust boundary. The Cardano Foundation’s Cardano Wallet security guide warns that trusted API access can expose sensitive information or delete wallet data. Spending additionally requires the passphrase or wallet secret key. Restrict which processes can reach a local wallet API and do not treat “local” as synonymous with safe.
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A hardware wallet reduces the risk that malware on a connected computer can extract its private keys, but it does not make the entire workflow harmless. A user can still authorize an unwanted or malicious transaction. The safety benefit depends on checking the device display and declining actions that do not match the intended recipient, amount, fees, or contract interaction.
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