feat(tempo): infer multisig config from account in prepareTransactionRequest

[jxom]

Follow-up DX improvement to the native multisig support added in #4710 (the feature is still unreleased).

What changed

• Account.fromMultisig accepts a raw config — it normalizes via MultisigConfig.from internally, so callers don't need to call it themselves.
• Multisig config is inferred from the account — pass the multisig account to prepareTransactionRequest and omit the multisig field. The runtime inference lives in chainConfig.ts (derives the config from account.source === 'multisig', sets from, keeps the multisig account as sender).
• The prepared request carries the multisig account as sender, so it doesn't need to be re-passed to sendTransaction.

import { Account } from 'viem/tempo'

const account = Account.fromMultisig({
  threshold: 2,
  owners: [
    { owner: owner_1.address, weight: 1 },
    { owner: owner_2.address, weight: 1 },
  ],
})

const request = await client.prepareTransactionRequest({
  account,
  feeToken: '0x20c0000000000000000000000000000000000001',
  to: '0xcafebabecafebabecafebabecafebabecafebabe',
  value: 1n,
})

const signature_1 = await client.signTransaction({ ...request, account: owner_1 })
const signature_2 = await client.signTransaction({ ...request, account: owner_2 })

const hash = await client.sendTransaction({
  ...request,
  signatures: [signature_1, signature_2],
})

Notes

• No changes to shared core (prepareTransactionRequest.ts is untouched). A tempo-exclusive field (calls/feeToken/multisig) narrows the prepared request's type to tempo.
• Updated the existing (unreleased) changeset and docs to the simplified API.
• Added a runtime test (infer multisig from account); full multisig e2e suite passes (5/5) against a multisig-enabled localnet.

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Project	Deployment	Actions	Updated (UTC)
viem	Ready	Preview, Comment	Jun 4, 2026 11:41am

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commit: f444620