Staking & Voting Rewards on the NNS
Stakeholders gain voting power and can earn voting rewards by staking their ICP tokens.
The Internet Computer is a decentralized platform whose evolution is decided by its stakeholders through voting. This means decision impacting the future of the Internet Computer are made by people vested in the outcome. In return for participation in governance, the Internet Computer gives out voting rewards. Voters can vote actively, or they can use the liquid democracy on the Internet Computer to automatically follow other voters.
In order to become vested and obtain voting power, ICP tokens must first be staked, and then locked up for a length of time greater than 6 months to, at most, 8 years.
Just as tokens are held in a user's account, stake is held in a special account called a "neuron". Each neuron has its own identifier, and several attributes relating to its stake. These include:
- the length of time it is locked for (the "dissolve delay");
- whether it is currently dissolving;
- and how much reward it has accrued as a result of voting on proposals (the "maturity").
Once a neuron is locked for more than six months, it gains the ability both to submit proposals and to vote on them. Voting in turn generates voting rewards, based on how active a neuron is in voting on proposals. If you vote on every open proposal, you gain the maximum reward.
A neuron can also "follow" other neurons, which causes it to automatically vote the same as the majority of the neurons that it follows. All new neurons by default follow neuron 27 held by the ICA, so any newly staked neuron will generate voting rewards as soon as it is locked for more than six months. The default following is applied to most proposal topics, except for proposals with topic Governance, where neuron holders have to explicitly vote to earn rewards.
The voting power of a locked neuron is determined by several factors:
- Principally, by its stake. 1 ICP = the power of 1 vote.
- Next, by its lock up duration, or dissolve delay. 6 months grants a 1.06x voting power bonus, and 8 years grants 2x. All other durations scale linearly between.
- Lastly, by its age, or length of time spent locked up without dissolving. 4 years grants a 1.25x bonus, multiplicative with any other bonuses. All other durations between 0 seconds and 4 years scale linearly between.
This means that the maximum voting power, of 2.5 votes per ICP staked, is only achievable by locking up your neuron for 8 years, and leaving it in that locked up state for 4 years. At that time you will have the most voting power for the stake committed.
Maturity represents the voting rewards accumulated in a neuron. Each day the network rewards participants by allocating to every voting neuron a portion of the total reward, based both on its voting power at the time proposals were made, and the number of proposals it voted on.
Please note that different tax authorities may take different views on the taxation status of the voting rewards. ICP stake holders who receive voting rewards should consult appropriate professionals.
For those who wish to compound the voting power in their neuron, the most natural activity is to "merge maturity" at intervals, which has the effect of minting the neuron's maturity and adding that minted amount back into the neuron's stake. If you wish to liquidate rewards you earn from the neuron, you can "spawn" maturity into a reward neuron, which mints the parent neuron's, and moves this maturity into the stake of a new neuron. It should be noted that if you do neither, and leave those gains in the form of maturity, it will not add to the minted total of ICP, nor contribute to your voting power.
Why Staking Matters
Staking is a way of allowing those who support the Internet Computer to decide what happens next with the platform.
When the Internet Computer first launched, all proposals required a majority vote to pass. Gradually, however, this is changing. After a recent update it is now possible for proposals to pass with only a majority among 3% of the total voting power, meaning that proposals stand a chance even if large entities abstain and the majority of the network does not vote.
Voting rewards are an important aspect of neurons and can be compounded to increase your total voting power. So to better understand staking and reward, it may be helpful to look at staking from two perspectives:
Short-term: voting rewards each day
Every day, rewards are granted by the network to each voting neuron. The percentage of those rewards received by each neuron depend on the following factors:
- Amount of ICP staked
- Length of dissolve delay
- "Age" of the neuron (time spent in a non-dissolving state)
- Number of eligible proposals the neuron has voted on
For example, if on a single day the NNS has generated 1000 ICP in total rewards (see below for more on how this is computed), and there were 10 proposals submitted which only two neurons voted on, and:
- Neuron A has a voting power of 20, and voted on all 10 proposals
- Neuron B has a voting power of 80, and voted on all 10 proposals
Then the 1000 ICP would be divided between these two neurons by their proportional voting power:
- Neuron A with voting power of 20, gets 20% of the total = 200 ICP
- Neuron B with voting power of 80, gets 80% of the total = 800 ICP
If either neuron had only voted for X% of those 10 proposals, it's reward would be decreased to X% of its maximum eligibility, with the remainder distributed among the other neurons.
Long-term: voting rewards over years
As of December 2021, here is the long-term voting rewards curve: https://dashboard.internetcomputer.org/circulation
In the first year, the NNS allocates 10% of the total supply to generate voting rewards. Note the term "allocates" rather than "mints", because rewards are not minted until they are spawn, merged or the neuron is disbursed, so total supply is not automatically increased by rewards alone. This allocation rate drops quadratically until it reaches 5% by year
- Like all parameters in the NNS, the minting rate can be changed via NNS proposals, but this is the current rate schedule.
Because the total supply of ICP is a dynamic system with deflation and inflation, it is impossible to predict what voting rewards will be on any given day or year in the future. It is relatively easy to predict what the percentage allocation rate will be months from now, but it is much harder to predict what the total supply will be both because of potential changes to the rate, and how often stakeholders will mint their maturity.
Inflationary and Deflationary Mechanisms
Deflationary mechanisms for ICP:
- Minting cycles to pay for compute and storage burns ICP to create cycles
- Burning of transaction fees
- Burning of the 1 ICP deposit for failed proposals; note that this only happens at disbursement or merging of neurons, so accumulated fees can persist for a while before finally contributing to deflation.
Inflationary mechanisms for ICP:
- Node providers are paid by minting ICP
- Voting rewards are paid by minting ICP, although this minting only happens at the moment rewards are spawned, maturity is merged, or the neuron is disbursed.