AereAgentWallet2of2 holds the agent's tokens and accepts only the agent's signature followed by the policy
service's, over the same digest. In the new cosign mode the wallet service signs only its half, after every
check it already made, and the agent adds its half only after it recomputes the payment itself (payer,
recipient, amount, the nonce of its own ledger entry, validity, digest, declared policy signer).
verifica-plati.mjs requires the wallet's code on chain to be exactly the compiled contract with the two
signers; recompileaza-contract.mjs recompiles the published artifact byte for byte with solc 0.8.23.
Tests: co-signing 16/16, payment verifier 14/14, negative control 30/30, wallet 25/25. On the public
testnet 28001 on 2026-09-29: 13/13 with the 2-of-2 wallet (the agent alone and the policy signer alone
refused by the facilitator and by the token asked on chain) and 9/9 with the wallet key. Evidence in
dovezi-28001/. Nothing here has been run on the Aere Network mainnet.
The agent does not hold the payment key: the wallet holds it for the owner and signs an EIP-3009 authorization only for a payment the
agent wrote into its signed ledger, verified without trusting the agent under the policy the owner pinned and against the ledger heads
the wallet itself saw (a branch is refused with a proof of equivocation, a backdated entry is refused), naming exactly this purchase,
written now, and within the limit judged also against what the wallet itself has signed. The authorization nonce is sha256(entry hash),
so the on-chain payment names the ledger entry. The policy gains an optional `wallet` field. Also: an x402 v2 client, a minimal resource
server, a local facilitator for tests, and verifica-plati.mjs, which proves from outside that a wallet's on-chain payments were allowed
by the agent's policy (with --all-transfers, that no payment left the wallet without a ledger entry).
Tests: wallet 25/25 and payment verifier 10/10 without a network (the verifier on chain responses recorded on testnet 28001), negative
control 21/21; policy 27/27, agents control 26/26. On the public testnet 28001 through its x402 facilitator: 9/9, with the evidence in
agents/x402/dovezi-28001/. Needs ethers (npm install in agents/x402).
