Sponsor Fee Transaction Binary Format

Learn more about sponsorship.

# Version 2

Binary format of version 2 is defined in transaction.proto (opens new window) 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. See the Sponsored fee article

#	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)
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.