CityCoins
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Mining
CityCoin contract functions related to mining.

Overview

Anyone can create a user interface for mining a CityCoin, two examples being minecitycoins.com and minemiamicoin.com.
Mining CityCoins happens by calling one of two functions in the contract: mine-tokens and mine-many.
Miners can only participate once per block. Once STX are sent for mining a CityCoin they are not returned, they are distributed to the city's wallet and CityCoin Stackers.
A nominal transaction fee is required in order to send this transaction, paid in STX, and in a single mining transaction you can optionally include a memo that will be recorded on-chain.

Details

To mine for a single block with mine-tokens:
  • enter the amount you would like to bid for the block
  • (optionally) enter a memo to be recorded on chain
  • submit the transaction to the smart contract
To mine for multiple blocks with mine-many:
  • select the number of blocks you would like to mine for
  • enter the amount for each of the number of blocks selected
  • submit the transaction to the smart contract

Contract Functions

get-mining-stats-at-block

Type: Read-only Function
Input: stacksHeight as uint
Returns: (some MiningStatsAtBlock) as a tuple or none
Returns the mining stats at a given block height, including:
  • minersCount - total miners
  • amount - total amount committed
  • amountToCity - amount transferred to city wallet
  • amountToStackers - amount transferred to $MIA Stackers
  • rewardClaimed - true/false if reward was claimed

get-mining-stats-at-block-or-default

Type: Read-only Function
Input: stacksHeight as uint
Returns: (some MiningStatsAtBlock) as a tuple, or defaults
Returns the same as get-mining-stats-at-block above, except if no entry is found, returns the default structure of:
  • minersCount: 0
  • amount: 0
  • amountToCity: 0
  • amountToStackers: 0
  • rewardClaimed: false

has-mined-at-block

Type: Read-only Function
Input: stacksHeight as uint and userId as uint
Returns: true or false
Returns a boolean value indicating if the user's ID mined at a given block height.

get-miner-at-block

Type: Read-only Function
Input: stacksHeight as uint and userId as uint
Returns: (some MinersAtBlock) as a tuple or (none)
Returns the mining stats for a given user ID and block height, including:
  • ustx - total commitment in uSTX
  • lowValue - used by VRF to determine winner
  • highValue - used by VRF to determine winner
  • winner - true/false updated after miner claims the reward

get-miner-at-block-or-default

Type: Read-only Function
Input: stacksHeight as uint and userId as uint
Returns: (some MinersAtBlock) as a tuple, or defaults
Returns the same as get-miner-at-block above, except if no entry is found, returns the default structure of:
  • ustx: 0
  • lowValue: 0
  • highValue: 0
  • winner: false

get-last-high-value-at-block

Type: Read-only Function
Input: stacksHeight as uint
Returns:highValue as uint, or default (u0)
Returns the last high value at a given block height, which is incremented with each miners' total commitment.

get-block-winner-id

Type: Read-only Function
Input: stacksHeight as uint
Returns: (some userId) as uint or none
Returns the user ID of the block winner after the miner claims the reward.

mine-tokens

Type: Public Function
Input: amountUstx as uint and memo as buff 34 (optional)
Success: (ok true)
Errors:
  • ERR_CONTRACT_NOT_ACTIVATED u1005
  • ERR_USER_ALREADY_MINED u1006
  • ERR_INSUFFICIENT_COMMITMENT u1007
  • ERR_INSUFFICIENT_BALANCE u1008
  • ERR_STACKING_NOT_AVAILABLE u1015
Mining for a single block happens through calling the mine-tokens function in the contract, which optionally accepts up to 34 characters as a memo to record on-chain.

mine-many

Type: Public Function
Input: amounts as list of uints, up to 200
Success: (ok true)
Errors:
  • ERR_CONTRACT_NOT_ACTIVATED u1005
  • ERR_USER_ALREADY_MINED u1006
  • ERR_INSUFFICIENT_COMMITMENT u1007
  • ERR_INSUFFICIENT_BALANCE u1008
  • ERR_STACKING_NOT_AVAILABLE u1015
Mining for many blocks happens through calling the mine-many function in the contract, which accepts a list of amounts up to 200 items in length.
Last modified 8d ago