SDK

Produce an ERC-1271 signature over an application digest, wrapped in the account's nested envelope so the wallet's isValidSignature accepts it. Offline and chain-independent — used for x402 payments, Permit2, EIP-3009, and intent-DEX orders.

import { createClient, BNB } from "@altananetwork/sdk";
import { hashTypedData } from "viem";
 
const client = createClient({ chains: [BNB] });
 
// From a raw digest:
const sig = await client.signOrder({ session, appDigest: "0x…" });
 
// Or from EIP-712 typed data (hashed for you):
const sig2 = await client.signOrderTypedData({ session, typedData });

signOrderTypedData({ session, typedData }) is exactly signOrder({ session, appDigest: hashTypedData(typedData) }).

Parameters

client.signOrder(opts: { session: Session; appDigest: Hex }): Promise<Hex>;
client.signOrderTypedData(opts: { session: Session; typedData: TypedDataDefinition }): Promise<Hex>;

Returns

A Hex signature — the wrapped envelope innerSig ‖ keyHash ‖ prehash (98 bytes for a secp256k1 session key; a WebAuthn envelope for passkey sessions). Verify it by calling the wallet's isValidSignature, not ecrecover.

Notes

• The signer must be a session key on the wallet (secp256k1 or passkey).
• For the signature to verify, the calling contract must be an approved checker for the session — see approveSignatureChecker.
• Works identically across chains; the nested account domain is stripped to verifyingContract.