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Verifying transactions with csv attachments - message contract
class MessageContract : Contract {
interface Commands : CommandData {
class Send(attachmentId: AttachmentId) : CommandWithAttachmentId(attachmentId), Commands
abstract class CommandWithAttachmentId(val attachmentId: AttachmentId) : CommandData {
override fun equals(other: Any?) = other?.javaClass == javaClass
override fun hashCode() =
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