# Ledger Module

# Why do you have a "book module"?

The ledger module is the data hub of the blockchain. The balances and transactions of all accounts are saved in the ledger module. A network-wide account book is saved on each network node to ensure complete, open and transparent data, while ensuring that data cannot be tampered and traceable.

# What does the "book module" do?

Provide data support for assembly transactions, mainly accounting and auditing, verify the legality of the transaction, such as: whether there is sufficient balance, whether to repeat payment (double flower)

# "Book Module" positioning in the system

The ledger module is the data hub, which stores the result data of all existing transactions in the system. It does not depend on any business modules, and other modules depend on it as needed. Explanation of nouns in ##《本本模块》

  • The random number of the transaction (nonce, the last 8 bytes of the transaction hash value)
    • nonce: A scalar value equal to the number of transactions sent at this address, which will be included in every transaction initiated by the user.
    • Each transaction in the account needs to save the previous nonce of the transaction.
    • Strictly speaking, a nonce is an attribute of the originating address (it only makes sense in the context of the sending address).However, the nonce is not explicitly stored in the blockchain as part of the account status.
    • The nonce value is also used to prevent incorrect calculation of account balances.For example, suppose an account has 10 NULS balances and signs two transactions, all of which cost 6 NULS with nonce 1 and nonce 2, respectively.Which of these two transactions is valid? In a blockchain distributed system, nodes may receive transactions out of order.Nonce forces transactions of any address to be processed in order, regardless of the interval, regardless of the order in which the nodes receive.This way, all nodes will calculate the same balance.Payments for 6 Ethereum will be processed successfully and the account balance will be reduced to 4 ether.Whenever it is received, all nodes consider it invalid with a transaction with nonce 2.If a node receives a nonce 2 transaction first, it will hold it, but will not commit it until it receives and processes the nonce 1 transaction.
    • Use nonce to ensure that all nodes calculate the same balance and sort the transactions correctly, which is equivalent to the mechanism used in Bitcoin to prevent "double payment".However, because Ethereum tracks account balances and does not track individual coins separately (called UTXO in Bitcoin), "double payments" only occur when the account balance is incorrectly calculated.The nonce mechanism can prevent this from happening.

# Interface List

# blockValidate

Whole block accounting verification

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
txList list<string> []Trade Hex Value List Yes
blockHeight long Block Height Yes

# return value

Field Name Field Type Parameter Description
value boolean true processed successfully, false processing failed

# verifyCoinData

Unconfirmed transaction check

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
tx string Trading Hex Value Yes

# return value

Field Name Field Type Parameter Description
Orphan boolean true orphan, false non-orphan

# rollbackTxValidateStatus

Rollback package check status

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
tx string Trading Hex Value Yes

# return value

Field Name Field Type Parameter Description
value boolean true rollback success, false rollback failure

# verifyCoinDataBatchPackaged

Package transaction check

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
txList list<string> []Transaction List (HEX Value List) Yes

# return value

Field Name Field Type Parameter Description
Fail list<string> Verify failed Hash value list
orphan list<string> Check the list of hash values for orphans
success list<string> Verify the list of successful hash values

# batchValidateBegin

Start bulk packaging: status notification

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes

# return value

Field Name Field Type Parameter Description
value boolean true processed successfully, false processing failed

# commitUnconfirmedTx

Unconfirmed transaction submitted to the ledger (check and update the nonce value)

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId string chain Id of operation, value range [1-65535] Yes
tx string Trading Hex Value Yes

# return value

Field Name Field Type Parameter Description
Orphan boolean true orphan trading, false non-orphan trading

# commitBatchUnconfirmedTxs

Unconfirmed transaction batch submission of bills (check and update nonce value)

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId string chain Id of operation, value range [1-65535] Yes
txList string []Trade Hex Value List Yes

# return value

Field Name Field Type Parameter Description
Orphan list<string> Orphan Trading Hash List
fail list<string> Verify failed transaction Hash list

# rollBackUnconfirmTx

Roll back the submitted unconfirmed transaction

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
tx string Trading Hex Value Yes

# return value

Field Name Field Type Parameter Description
value boolean true success, false failure

# clearUnconfirmTxs

Clear all account unconfirmed transactions

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes

# return value

Field Name Field Type Parameter Description
value boolean true success, false failure

# commitBlockTxs

Submit block

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
txList list<string> Trading Hex Value List Yes
blockHeight long Block Height Yes

# return value

Field Name Field Type Parameter Description
value boolean true success, false failure

# rollBackBlockTxs

Block rollback

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
txList list<string> []Trade Hex Value List Yes
blockHeight string Block Height Yes

# return value

Field Name Field Type Parameter Description
value boolean true success, false failure

# getNonce

Get the account asset nonce value

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
assetChainId int Asset Chain Id, Value Range [1-65535] Yes
assetId int Asset Id, value range [1-65535] Yes
address string address of the asset yes

# return value

Field Name Field Type Parameter Description
nonce string account asset nonce value
nonceType integer 1: confirmed nonce value, 0: unconfirmed nonce value

# getBalance

Get account assets (into the block)

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Run Chain Id, Value Range [1-65535] Yes
assetChainId int Asset Chain Id, Value Range [1-65535] Yes
assetId int Asset Id, value range [1-65535] Yes
address string address of the asset yes

# return value

Field Name Field Type Parameter Description
total biginteger Total Amount
freeze biginteger Freeze amount
available string Available Amount

# getBalanceNonce

Get account asset balance and nonce value

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
assetChainId int Asset Chain Id, Value Range [1-65535] Yes
assetId int Asset Id, value range [1-65535] Yes
address string address of the asset yes

# return value

Field Name Field Type Parameter Description
nonce string account asset nonce value
nonceType integer 1: confirmed nonce value, 0: unconfirmed nonce value
available biginteger Available Amount
permanentLocked biginteger Permanent Locked Amount
timeHeightLocked biginteger Height or Time Locked Amount

# getFreezeList

Paging to get a list of account lock assets

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Run Chain Id, Value Range [1-65535] Yes
assetChainId int Asset Chain Id, Value Range [1-65535] Yes
assetId int Asset Id, value range [1-65535] Yes
address string address of the asset yes
pageNumber int Number of Starts Yes
pageSize int Number of pages per page Yes

# return value

Field Name Field Type Parameter Description
totalCount integer Total Records
pageNumber integer Number of Starts
pageSize integer Number of pages per page
list list<object> Locked Money List
        txHash string Trading hash
        amount biginteger Locked Amount
        lockedValue long Lock time or height, -1 is permanent lock
        time long Transaction time, seconds

# getAssetsById

Amount information of the specified asset collection under the query chain

# scope:public

# version:1.0

# parameter list

Parameter Name Parameter Type Parameter Description Is Not Empty
chainId int Chain ID of the run, value range [1-65535] Yes
assetIds string asset id, comma separated yes

# return value

Field Name Field Type Parameter Description
assetId integer Asset id
availableAmount biginteger Available Amount
freeze biginteger Freeze amount
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Last Updated: 9/5/2019, 4:50:57 PM

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