@cfxlabsinc/b2b-services
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    EscrowParty:
        | { address: Address; type: "WALLET" }
        | { ledgerAccountId: string; type: "LEDGER_ACCOUNT" }

    Either side of an escrow: a self-custody wallet address, or one of the customer's own ledger accounts (ESCROW_ON_MINTFX.md §3).