# Structure
The three different account types are Normal, AssetIssue, and Contract. An Account contains 7 parameters:
1. **account\_name**: the name for this account – e.g. BillsAccount.
2. **type**: what type of this account is – e.g. 0 (stands for type ‘Normal’).
3. **balance**: balance of this account – e.g. 4213312.
4. **vote**: received votes on this account – e.g. {(“0x1b7w…9xj3”,323), (“0x8djq…j12m”,88),…,(“0x82nd…mx6i”,10001)}.
5. **asset**: other assets expected LGCY in this account – e.g. {, }.
6. **latest\_operation\_time:** the latest operation time of this account.
Protobuf data structure:
message **Account** {
message **Vote** {
**bytes** vote\_address = **1**;
**int64** vote\_count = **2**;
}
**bytes** accout\_name = **1**;
AccountType type = **2**;
**bytes** address = **3**;
**int64** balance = **4**;
**repeated** Vote votes = **5**;
map<**string**, **int64**> asset = **6**;
**int64** latest\_operation\_time = **10**;
}
enum AccountType {
Normal = 0;
AssetIssue = 1;
Contract = 2;
}\
**BLOCK**
A block typically contains a block header and several transactions.
Protobuf data structure:
message **Block** {
BlockHeader block\_header = **1**;
repeated Transaction transactions = **2**;
}
**BLOCK HEADER**
A block header contains raw\_data, witness\_signature, and blockID.
Protobuf data structure:
message BlockHeader {
message raw {
int64 timestamp = 1;
bytes txTrieRoot = 2;
bytes parentHash = 3;
uint64 number = 4;
uint64 version = 5;
bytes witness\_address = 6;
}
bytes witness\_signature = 2;
bytes blockID = 3;
}
**Raw Data**
Raw data is denoted as **raw\_data** in Protobuf. It contains the raw data of a message, containing 6 parameters:
1. **timestamp**: timestamp of this message – e.g. 1543884429000.
2. **txTrieRoot**: the Merkle Tree’s Root – e.g. 7dacsa…3ed.
3. **parentHash**: the hash of the last block – e.g. 7dacsa…3ed.
4. **number**: the block height – e.g. 4638708.
5. **version**: reserved – e.g. 5.
6. **witness\_address**: the address of the witness packed in this block – e.g. 41928c…4d21
**WITNESS SIGNATURE**
Witness signature is denoted as witness\_signature in Protobuf, which is the signature for this block header from the witness node.
**BLOCK ID**
Block ID is denoted as blockID in Protobuf. It contains the atomic identification of a block. A Block ID contains 2 parameters:
1. **hash**: the hash of block.
2. **number**: the hash and height of the block.
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