New block types

CORE

The new version presumes blocks with technical information on the blockchain in addition to the existing ones:

• blocks of block confirmation,
• blocks of rejected transaction information.

New blocks go along with the main ones. First comes the block size in int64 format, then the block itself.

Confirmation Blocks

They are introduced for more timely provision of blocks confirmation information to the main chain. Also, there is an option to confirm forging blocks and state blocks without a need to create a regular block.

Block format:

№	Name	Type	Size	Description
1	block_type	uint64_t	8	Block type - 0x1100111167452301
2	block_timestamp	uint64_t	8	Block creation time
3	prev_hash	array	32	Block hash to which confirmations belong
4	tx_size	varint	1-9	Confirmation transaction size
5	ApproveRecord	array	tx_size	Confirmation transaction
6	...		Steps 4 and 5 Not step 7
7	tx_size = 0	varint	1	If transaction size is zero, a block ends

Confirmation transaction format:

№	Name	Type	Size	Description
1	block_hash	array	32	Block hash which is confirmed
2	sign_size	varint	1-9	Signature size
3	sign	array	sign_size	Hash signature
4	pubk_size	varint	1-9	Public key size
5	pub_key	array	pubk_size	The public key by which the hash was signed

Information blocks of rejected transactions

They inform users about the reasons for transaction rejection by the Core.

Block format:

1	block_type	uint64_t	8	Block type - 0x3300111167452301
2	block_timestamp	uint64_t	8	Block creation time
3	block_timestamp	array	32	Block hash with the relevance of which transactions were rejected
4	sign_size	varint	1-9	Signature size
5	sign	array	sign_size	Transaction signature (from the public key end to the block end)
6	pubk_size	varint	1-9	Public key size
7	pubk	array	pubk_size	The public key by which transactions were signed
8	tx_size	varint	1-9	Confirmation transaction size
9	RejectedTXInfo	array	tx_size	Confirmation transaction
10	...			Steps 8 and 9 Not step 11
11	tx_size = 0	varint	1	If transaction size is zero, a block ends

Confirmation transaction format:

№	Name	Type	Size	Description
1	tx_hash	array	32	Hash of reject transaction
2	reason	varint	1-9	Error code that rejected the transaction

Decoding error codes:

№	Reason	Code
1	A transaction was sent from a zero wallet	0xff01
2	The fee is not enough to send a transaction	0xff02
3	There is not enough funds in wallet to complete a transaction	0xff03
4	There is a wrong nonce	0xff04
5	There is not enough funds in wallet to complete a transaction	0xff05
6	There is an invalid sender or receiver address format	0x0404