# MassTransferTransaction
Structure of a Mass Transfer transaction.
# Fields
| # | Name | Data type | Description |
|---|---|---|---|
| 1 | assetId | ByteVector|Unit | Token ID. unit means WAVES |
| 2 | totalAmount | Int | Amount of the token to be transferred |
| 3 | transfers | List[Transfer] | Transfers |
| 4 | transferCount | Int | Number of transfers |
| 5 | attachment | ByteVector | Optional data attached to the transaction. This field is often used to attach a comment to the transaction. The maximum data size is 140 bytes |
| 6 | id | ByteVector | Transaction ID |
| 7 | fee | Int | Transaction fee |
| 8 | timestamp | Int | Transaction timestamp |
| 9 | version | Int | Transaction version |
| 10 | sender | Address | Address of the transaction sender |
| 11 | senderPublicKey | ByteVector | Public key of the transaction sender |
| 12 | bodyBytes | ByteVector | Transaction body bytes |
| 13 | proofs | List[ByteVector] | Proofs |