# Quota

# What is Quota

In Ethereum, in order to have a transaction executed timely, the sender usually has to offer an appealing transaction fee to miner. The higher gas price offered, the sooner transaction executed. In this typical bidding model, the supply of system processing capability and the demand of sending transactions are balanced by gas price automatically. This model works fine in Ethereum, however, from user's perspective it is hard to determine what is the best gas price to offer for a certain time. Either too low or too high price will cause a market failure. Moreover, since gas is associated with individual transactions, it is impossible to measure and allocate computational resources at account level. In Vite, instead of charging transaction fees, a certain amount of quota is consumed when user sends a transaction, such as transfer, deploying new smart contract, calling smart contract, issuing new token, registering SBP, retrieving mining rewards, voting and staking. Vite has implemented a quota model to meet the supply and demand of resources.

Quota can be obtained in two ways:

• Obtain one-time, small-amount quota by computing PoW when sending transactions, or
• Stake VITE for account.

If you just simply need to send a transaction, you can choose PoW . If you need send many transactions during a short period, you should stake VITE to get enough quota.

We recommend staking.

# Quota Consumption Rules

Various quota consumptions of different transactions:

Transaction Type	Quota Consumed	In Unit Transaction
Send a transfer without comment	21000	1
Receive a transfer	21000	1
Register SBP	62200	2.9619
Update SBP registration	62200	2.9619
Cancel SBP registration	83200	3.9619
Retrieve mining rewards	68200	3.2476
Vote	62000	2.9524
Cancel voting	62000	2.9524
Stake for quota	82000	3.9048
Cancel staking for quota	73000	3.4762
Stake for quota via delegation	82000	3.9048
Cancel staking for quota via delegation	73000	3.4762
Issue new token	104525	4.9774
Mint additional token	69325	3.3012
Burn token	48837	2.3256
Transfer token ownership	58981	2.8086
Change token type	63125	3.0060

• Unit Transaction: The minimal transaction unit measured in quota consumption, equivalent to an un-commented transfer transaction

Each character in transaction's comment consumes additional 68 quota.

For example, given hex encoding is used, sending a transfer with a comment of '0x0001' (two characters) will consume

quota, which translates to 1.0065 unit transaction.

If ConfirmTimes is assigned when creating new smart contract, for each response transaction of the contract, an additional quota about ConfirmTimes * 200 will be charged. ConfirmTimes defines a waiting number that specifies in how many confirmations the contract will produce a response after the request transaction is snapshotted.

# Quota Calculation

Quotas are calculated in the following formulas:

Here,

• : Quota obtained through PoW calculation. This quota is valid once and can only be used in current transaction
• : Quota obtained by staking. This quota is long-time valid and can be accumulated for up to 75 snapshot blocks
• : Quota cap of one account, related to overall system throughput and total account number
• : The difficulty of PoW calculated
• : The weight obtained through PoW calculation
• : The staking amount
• : The weight obtained by staking
• : The idle time prior to sending a transaction, equivalent to height difference between the snapshot block that current transaction refers to and an earlier snapshot block that previous transaction refers to

In Vite TestNet,

• = 1000000
• = 6.259408129e-10
• = 4.201037667e-24

UTPS: Unit transaction per second, referring to how many un-commented transfer transactions can be sent by one account in one second

The available quota of an account depends on UTPS and quota consumption during last 74 snapshot blocks. For example, account A has 1 UTPS quota through staking and hasn't send any transaction during last 74 snapshot blocks, then the available quota of account A is 75 UTPS.

The actual available quota of an account upon sending transaction depends on UTPS, quota consumption during last 74 snapshot blocks and PoW calculation performed. For example, account B has 1 UTPS quota through staking, hasn't send any transaction during last 74 snapshot blocks, and calculated a PoW having difficulty equivalent to 2 UTPS, then the available quota of account B is 77 UTPS.

For convenience in calculation, it is acceptable to calculate or only, and then map result to corresponding quota according to following table:

or		UTPS	Approximately equivalent to how much VITE staked without calculating PoW	Approximately equivalent to how difficult the PoW calculated without staking
0.0	0	0	0	0
	21000	1	10000	67108863
	42000	2	20007	134276984
	63000	3	30033	201563940
	84000	4	40085	3733274509
	105000	5	50173	290666828
	126000	6	60306	310523977
	147000	7	70494	360275060
	168000	8	80746	428403748
	189000	9	91073	496921930
	210000	10	101486	565896574
	231000	11	111995	635397250
	252000	12	122612	705496588
	273000	13	133350	776270783
	294000	14	144222	847800161
	315000	15	155241	920169805
	336000	16	166424	993470265
	357000	17	177787	1067798363
	378000	18	189346	1143258118
	399000	19	201122	1219961801
	420000	20	213135	1298031169
	441000	21	225407	1377598894
	462000	22	237966	1458810249
	483000	23	250838	1541825095
	504000	24	264056	1626820249
	525000	25	277654	1713992319
	546000	26	291673	1803561138
	567000	27	306158	1895773931
	588000	28	321161	1990910446
	609000	29	336741	2089289313
	630000	30	352969	2191275997
	651000	31	369924	2297292878
	672000	32	387705	2407832162
	693000	33	406426	2523472634
	714000	34	426227	2644901733
	735000	35	447279	2772945111
	756000	36	469795	2908606929
	777000	37	494048	3053125976
	798000	38	520387	3208055683
	819000	39	549280	3375381406
	840000	40	581368	3557697962
	861000	41	617561	4144793358
	882000	42	659220	4424389078
	903000	43	708510	4755203412
	924000	44	769198	5162514130
	945000	45	848763	5696519539
	966000	46	965808	6482075769
	987000	47	1197189	8034995932

For example, given PoW is not calculated, staking 10000 and 20007 VITE will obtain 1 and 2 UTPS quota respectively, while staking 134 VITE and waiting 75 snapshot blocks(approximately 75 seconds) also qualifies for sending a transfer transaction without comment.

# Two Methods to Obtain Quota

# Staking

Quota can be obtained through staking. The specified recipient account will receive the corresponding quota after the staking transaction is processed successfully.

# Parameters

• Staking amount: The minimum staking amount is 134 VITE
• Quota recipient address: The account who receives quota. This could be the staking account itself or any other account since staking for other accounts is permitted.

The VITE staked will be temporarily deducted from user's balance and cannot be transferred during staking period. The staking account can retrieve staked tokens after 259,200 snapshot blocks (about 3 days) by sending a cancel-staking transaction. As a result, the corresponding quota will be deducted from recipient's account immediately.

# Calculating PoW

User can obtain one-time-valid quota by calculating PoW upon sending transactions. According to above table, the target PoW difficulty is 0x3FFFFFF for sending an uncommented transfer transaction with no staking.

In the TestNet, a central PoW service has been built to serve the purpose of calculating PoW from Vite wallets, some of which, like mobile wallets, may not have sufficient computation power to perform the calculation.

# Calculation Steps

1. Convert to in following formula:

= 2**256 / (1 + 1/)

• : PoW difficulty in 256-bit number, with zeros padded at front when less than 256 bits
• : PoW target in 256-bit number, usually having 1 at first bit

For example, given = 0x3FFFFFF, then = 0xFFFFFFC000000000.

2. Work out correct from transaction data. is the proof of work. In this process, random numbers are constantly assigned to until the following condition is met: