[ripple]Memos

https://ripple.com/ko/build/transactions/#memos

Memos

The Memos field includes arbitrary messaging data with the transaction. It is presented as an array of objects. Each object has only one field, Memo, which in turn contains another object with one or more of the following fields:

Field	Type	Internal Type	Description
MemoData	String	VariableLength	Arbitrary hex value, conventionally containing the content of the memo.
MemoFormat	String	VariableLength	Hex value representing characters allowed in URLs. Conventionally containing information on how the memo is encoded, for example as a MIME type.
MemoType	String	VariableLength	Hex value representing characters allowed in URLs. Conventionally, a unique relation (according to RFC 5988) that defines the format of this memo.

The MemoType and MemoFormat fields should only consist of the following characters: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!{{0}}amp;'()*+,;=%

The Memos field is limited to no more than 1KB in size (when serialized in binary format).

Example of a transaction with a Memos field:

{
    "TransactionType": "Payment",
    "Account": "rMmTCjGFRWPz8S2zAUUoNVSQHxtRQD4eCx",
    "Destination": "r3kmLJN5D28dHuH8vZNUZpMC43pEHpaocV",
    "Memos": [
        {
            "Memo": {
                "MemoType": "687474703a2f2f6578616d706c652e636f6d2f6d656d6f2f67656e65726963",
                "MemoData": "72656e74"
            }
        }
    ],
    "Amount": "1"
}