# Sponsor Fee Transaction Binary Format
Learn more about sponsorship.
# Version 2
Binary format of version 2 is defined in transaction.proto protobuf scheme. The fields that are common to all types of transactions are described in the Transaction Binary Format article.
Version 2 is enabled by feature #15 “Ride V4, VRF, Protobuf, Failed transactions”.
message SponsorFeeTransactionData {
Amount min_fee = 1;
};
message Amount {
bytes asset_id = 1;
int64 amount = 2;
};
| Field | Size | Description |
|---|---|---|
| min_fee.asset_id | 32 bytes | ID of asset |
| min_fee.amount | 8 bytes | Amount of asset that is equivalent to 0.001 WAVES (100 000 WAVELET), specified in the minimum fraction (“cents”) of asset. The default value means disable sponsorship. See the Sponsored fee article |
# Version 1
| # | Field | JSON field name | Field type | Field size in bytes | Comment |
|---|---|---|---|---|---|
| 1 | Version flag | Byte | 1 | Indicates the transaction version is 2 or higher. Value must be 0 | |
| 2 | Transaction type ID | type | Byte | 1 | Value must be 14 |
| 3 | Transaction version | version | Byte | 1 | Value must be 1 |
| 4 | Transaction type ID | type | Byte | 1 | This field duplicates field 2 |
| 5 | Transaction version | version | Byte | 1 | This field duplicates field 3 |
| 6 | Public key of the transaction sender | senderPublicKey | Array[Byte] | 32 | |
| 7 | Token ID | assetId | Array[Byte] | 32 | |
| 8 | Minimal sponsored asset fee | minSponsoredAssetFee | Long | 8 | Amount of sponsored asset that is equivalent to 0.001 WAVES (100,000 WAVELET) 0 means disable sponsorship. |
| 9 | Transaction fee | fee | Long | 8 | |
| 10 | Transaction timestamp | timestamp | Long | 8 | |
| 11 | Transaction proofs | proofs | See Transaction Proofs Binary Format | S | If the array is empty, then S = 3. If the array is not empty, then S = 3 + 2 × N + 64 × N, where N is the number of proofs in the array.The maximum number of proofs in the array is 8. The size of each proof is 64 bytes |
The fields numbered in bold are the transaction body bytes.
# JSON Representation of Transaction
See the example in Node API.