Create message-based transaction request

Create a transaction request for signing a message with the wallet keys. Wallet requirement: Only multi-party computation (MPC) wallets are supported. Supported chains: EVM-compatible chains (ETH, BSC, Polygon, etc.), Solana, and Cardano. UTXO-based chains (Bitcoin, Litecoin, etc.) are not supported.

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string
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length ≥ 1
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intent
object
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string
enum
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boolean
string
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