Token Configuration

An overview of the token component of the CityCoins protocol.

CityCoins require the Stacks Web Wallet to interact with the smart contracts on the Stacks blockchain. (see How do I get started?)

Overview

CityCoins are fungible tokens on the Stacks blockchain with no ICO, no pre-sale, and no pre-mine.

Once a CityCoin is deployed and activated, the emission schedule begins and winning miners mint the CityCoin into existence.

CityCoins can be sent and received using a STX address, used for payment in smart contracts, and more.

For a more technical explanation, please see the contract functions for CityCoins tokens.

Emissions Schedule

Miners receive coinbase rewards for mining CityCoins outlined in the table on this page per block.

The emission schedule does not begin until mining is activated, and once it begins, the current block height of the Stacks blockchain is recorded in the smart contract.

From there, the amount of CityCoins rewarded through mining follow a doubling epoch halving schedule, where the mining rewards are cut in half in intervals over the next 20 years.

There is a bonus block reward for early miners who participate in the first 10,000 blocks.

Epoch	Epoch Length	Epoch End Block	Block Reward
0	10,000	10,000	250,000
1	25,000	35,000	100,000
2	50,000	85,000	50,000
3	100,000	185,000	25,000
4	200,000	385,000	12,500
5	400,000	785,000	6,250
6	n/a	n/a	3,125

After the final halving the total supply is estimated to be 17,500,000,000 CityCoins and will increase indefinitely by an estimated 164,062,500 CityCoins per year.

The values above are denoted in CityCoins, and the values in the contract and APIs the value will represent the reward/supply above multiplied by 1,000,000 to account for the 6 decimal places as micro-CityCoins.

Decimals

CityCoins have 6 decimals, denoted with u for micro-.

Currency	Unit
Bitcoin	1 BTC = 100,000,000 Satoshis
Stacks	1 STX = 1,000,000 micro-STX (uSTX)
CityCoins	1 CityCoin = 1,000,000 micro-CityCoin
MiamiCoin	1 MIA = 1,000,000 uMIA
NewYorkCityCoin	1 NYC = 1,000,000 NYC

Since CityCoins have 6 decimals, there will be places that may show the balance of CityCoins * 1,000,000. This is not a bug.

What's showing is the "raw" value on-chain, which represents micro-CityCoins. Consider a 50,000 MIA block reward - claiming from the contract will mint 50,000,000,000 uMIA which is then displayed correctly in wallets based on the number of decimals.

You can also see this in V1 to V2 conversion transactions, where for example, 50 MIA (V1) is burned and 50,000,000 uMIA (V2) minted, and both are equivalent in value because V2 MIA has 6 decimal places.