Block Reward Contract

Overview

The Block Reward contract manages block reward payouts to validators. Block rewards are issued as native Energy Web tokens that are minted by the engine.

Two entities are rewarded by each created block:

1. The block author (validator)

2. The community fund

Interaction graph for the block reward contract

Documentation and Source Code

• Energy Web Block Reward Contract
• OpenEthereum documentation on Block Reward Contract

Block Reward Payouts

Block Authors

Block authors are rewarded each time they seal a block. The amount issued to block authors decreases over time, as depicted by the Discreet S Curve.

Calculator: https://github.com/energywebfoundation/discrete-scurve-calculator

Fig. 2.: Discrete inverse S curve use for block rewards. Calculated for a 5 second step size, 10 million ethers total payout over 10 years

Energy Web Community Fund

A portion of block rewards goes to the Community Fund. Unlike the amount awarded to block authors, the amount that goes to the Community Fund remains constant over time.

The amount is chosen to add up to roughly 37.9 million tokens over a 10 year period. The community fund can change its own address and set a payout address too.

With 5 second step size: Payout-per-block = 600900558100000000 wei

Visual representation of the community reward distribution is depicted below in Fig. 3.

Fig. 3.: Community reward distribution.

Interaction with Block Reward Contract

Contract Address and ABI

Name	Address	JSON ABI
RewardContract	0x1204700000000000000000000000000000000002	https://gist.github.com/ngyam/07d34631fa0e899e5896303b5ec92a3c

Function Name	Description
mintedTotally()	Returns the token amount that was minted totally in wei
mintedForCommunity()	Return the token amount that was totally minted for the community fund in wei
mintedForCommunityForAccount(address)	Returns the total token amount that was minted for a certain address for the community so far in wei
mintedForAccount(address)	Return how much was minted for an account so far in wei
mintedInBlock(uint256)	Returns how much was minted in certain block in wei
mintedForAccountInBlock(address, uint256)	Returns how much was minted for a certain account in a certain block in wei
communityFundAmount()	Returns the constant payout for the community per block in wei
communityFund()	Returns community fund address
payoutAddresses(address)	Returns an address' payout address
setPayoutAddress(address)	Sets payout address for sender
resetPayoutAddress()	Resets payout address for sender
getBlockReward(uint256)	Returns blockreward amount for a certain block number
checkRewardPeriodEnded()	Returns true if blockreward period has ended (based on blocknumber), false otherwise. The blockreward period right now ends after 10 years. After that no blockrewards or community fund payouts are minted.

Callable functions