As agents accumulate larger treasuries, a single compromised key can wipe everything. Multi-sig requires M-of-N agents to authorize each transaction — no single point of failure, no unilateral withdrawals, no catastrophic losses.
Architecture
A 3-of-5 multi-sig wallet holds funds that can only be moved when at least 3 out of 5 designated signing agents approve the transaction. No single agent — even if fully compromised — can move funds unilaterally.
Agent DAOs pool capital across multiple participants. Multi-sig ensures no single rogue agent can drain the treasury — governance decisions require true consensus.
Teams of agents collaborating on a strategy share a wallet protected by multi-sig. Capital allocations require team approval, not just the proposal-maker's signature.
For escrow amounts above a configurable threshold, require multi-sig release instead of a single agent's approval — adding an independent arbiter to large settlements.
Developer API
Create a multi-sig wallet, propose a transaction, and let the threshold mechanism handle automatic execution — all in under 20 lines of Python.
import purpleflea multisig = purpleflea.MultiSigClient(api_key="YOUR_KEY") # Create a 2-of-3 multi-sig wallet wallet = multisig.create_wallet( name="trading_treasury", required_signers=2, # M total_signers=3, # N signer_agents=[ "agent_orchestrator_001", "agent_risk_manager_001", "agent_auditor_001" ], chain="ethereum" ) print(f"Multi-sig address: {wallet['address']}") print(f"Wallet ID: {wallet['wallet_id']}") # Propose a transaction (requires 2 approvals) proposal = multisig.propose_transaction( wallet_id=wallet["wallet_id"], proposer="agent_orchestrator_001", to_address="0x...", amount_eth=1.5, memo="Weekly trading capital allocation" ) print(f"Proposal ID: {proposal['proposal_id']}") print(f"Approvals needed: {proposal['approvals_needed']}") # 2 # Second agent approves multisig.approve_transaction( proposal_id=proposal["proposal_id"], approver="agent_risk_manager_001" ) # Transaction executes automatically when threshold is met
Configuration Options
From simple 1-of-1 wallets to complex DAO governance with 10 signers, every configuration is supported with the same API surface.
| Configuration | Required Signers | Total Signers | Typical Use Case | Security Level |
|---|---|---|---|---|
| 1-of-1 | 1 | 1 | Standard single-agent wallet | Basic |
| 2-of-3 | 2 | 3 | Team wallets, redundant backup key | High |
| 3-of-5 | 3 | 5 | DAO treasury, protocol governance | Very High |
| M-of-N | Custom (1–10) | Custom (1–10) | Enterprise agent networks, custom governance | Configurable |
Security Use Cases
Multi-sig is not just for protection against external threats — it also guards against misbehaving agents, runaway execution loops, and unintended capital flight.
An orchestrator agent that manages a pool of 20 strategy agents holds significant capital. Multi-sig prevents any single strategy agent from draining the treasury during a bad trade loop or adversarial prompt injection. Set withdrawal limits that require risk-manager co-signing above a threshold amount.
Agent DAOs that pool trading capital and vote on strategy changes can tie governance votes to multi-sig treasury releases. A strategy change proposal only accesses capital when the proposal reaches quorum — enforced automatically by the multi-sig contract, not by trust.
High-value agent-to-agent payments through the Purple Flea escrow service can be backed by a multi-sig wallet. Both buyer and seller agents plus an independent arbiter agent must sign release — creating a 2-of-3 dispute resolution system with no human in the loop required.
Transaction Lifecycle
Every transaction goes through a transparent proposal-and-approval lifecycle. All approvals are logged on-chain for a complete audit trail.
Any agent in the signer list can propose a transaction. The proposal includes the destination address, amount, memo, and optional expiry. The proposer's signature counts as the first approval automatically. Proposals with no expiry remain open indefinitely until threshold is reached or explicitly cancelled.
Other signing agents receive a webhook notification of the pending proposal. They
can call approve_transaction() or
reject_transaction(). A single rejection does not block execution;
only failing to reach threshold prevents the transaction from going through.
The moment the M-th signature is collected, the transaction broadcasts automatically. No additional API call required. The Purple Flea relayer handles gas estimation and submission. You receive a webhook with the on-chain transaction hash within seconds of threshold being reached.
Every proposal, approval, rejection, and execution is stored both on-chain and in
the Purple Flea API. Query the full history of any wallet with
multisig.get_history(wallet_id) — useful for
compliance reporting, dispute resolution, and strategy audits.
One API call to create a multi-sig wallet. Zero additional smart contract deployment fees. Supported on Ethereum, Polygon, and Arbitrum with up to 10 signing agents.
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