Sign and verify with React Native - Polygon Developer Docs

Signing produces a signature without submitting a transaction. The React Native SDK signs and verifies against the active wallet, so these operations require a completed wallet session. The public verification methods do not accept an explicit wallet address.

Sign and verify a message

Use the same network and exact message for signing and verification:

import { Networks } from '@polygonlabs/oms-wallet-react-native'

const message = 'I authorize this action'

const signature = await omsWallet.wallet.signMessage({
  network: Networks.amoy,
  message,
})

const isValid = await omsWallet.wallet.isValidMessageSignature({
  network: Networks.amoy,
  message,
  signature,
})

isValidMessageSignature returns false when the signature does not validate for the active wallet, network, and message.

Sign and verify a Solana message

For a selected Solana wallet, use the Solana-specific methods. Off-chain messages do not take a network because they are not cluster-specific.

const message = 'Approve login for example.com'

const signature = await omsWallet.wallet.signSolanaMessage({ message })

const isValid = await omsWallet.wallet.isValidSolanaMessageSignature({
  message,
  signature,
})

Both calls use the active Solana wallet.

Sign and verify typed data

Pass the EIP-712 data as a JSON-serializable object with domain, types, primaryType, and message. The SDK serializes it with JSON.stringify before passing it to the native layer, so write integer values as numbers or decimal strings instead of bigint:

const typedData = {
  domain: {
    name: 'Example',
    version: '1',
    chainId: 80002,
  },
  types: {
    Action: [{ name: 'description', type: 'string' }],
  },
  primaryType: 'Action',
  message: {
    description: 'Approve action',
  },
}

const signature = await omsWallet.wallet.signTypedData({
  network: Networks.amoy,
  typedData,
})

const isValid = await omsWallet.wallet.isValidTypedDataSignature({
  network: Networks.amoy,
  typedData,
  signature,
})

The chainId in the EIP-712 domain remains part of the signed payload. The wallet method also requires the corresponding exported network value.

Verification uses the currently active wallet. If the app switches wallets between signing and verification, switch back to the signer before calling the verification method.

​Sign and verify a message

​Sign and verify a Solana message

​Sign and verify typed data

Sign and verify a message

Sign and verify a Solana message

Sign and verify typed data