验证人负责维护重要网络基础设施，并代表权益投票人制定变更规则和治理决策。由于CyberMiles 系统中只有19个验证人，因此验证人必须通过竞争获取权益投票人的选票（即投票的CMT）。这些竞争包括提供能够运行最新的软件的安全服务器，提供足够的计算能力和网络带宽，为CyberMiles 的全球性区块链网络提供动力。
权益投票人自己通常没有能力或者不愿意运行真正为区块链网络提供动力的计算机服务器。因此，权益投票人通过将CMT 投票给具体的验证人候选人，来雇佣，即选举，其他CMT 持有者，即验证人。验证人负责维护重要网络基础设施，并代表权益投票人制定变更规则和治理决策。
Delegators pay validators with a portion of their block awards. Each validator’s share of the block award is called the validator’s compensation. A validator’s compensation is determined at the time of staking. It is recorded and enforced by the network itself.
The compensation rate is set by the validator himself, directly in competition with the others”. Last but not least, validators participate in the network governance.
The validators need to run super nodes, which are professionally operated by network servers to ensure the performance and security of the blockchain network.
In addition to network servers, a minimum amount of 10 millions CMT and upon a new candidate declaration, the network immediately takes 10% of the declared maximum amount of stake from the candidate’s own account, and keep it as stake.
Since there are only 19 validators in the CyberMiles system, validators must compete for delegators’ votes (staked CMTs) in order to be hired by providing secure servers running up-to-date software, sufficient computing power and network bandwidth to power the global blockchain network.
However, CyberMiles Foundation will also give an additional certification to the candidates that we judge are trustworthy to become one of the 19 Validators.
A validator candidate declares its candidacy to the network. It will give out 3 pieces of information in the declaration:
- Details of its operation and credentials, including jurisdiction, data center location, security setup, and technical setup. The CyberMiles Foundation will evaluate all validator candidates, and publicly indicate the candidates that meet the Foundation’s standards (i.e., information accuracy, technical competency, and hardware / network setup). However, the token holders are free to stake for any candidate regardless whether it meets the Foundation standard or not.
- The maximum amount of CMTs it is willing to accept as stakes. In order to prevent any single validator from growing too big and therefore risking monopoly, the network protocol punishes delegators who stake in very large validators. (see the “B4. Block award and validator’s compensation” section for details)
- The validator’s compensation rate it requires from delegators. For example, a 40% rate means that 40% of the block awards earned by delegators who staked this validator, will be paid to this validator as compensation.
The CyberMiles Foundation will review the candidate’s information. If the foundation can verify the accuracy of the information, it will denote on-chain that the candidate is “verified”. CMT holders can stake any validator candidate they like, including the unverified ones, but verified candidates from the foundation give CMT holders more confidence to stake.
The votes are casted in the form of staking one’s tokens. The staked tokens are locked by the network as collaterals and can be confiscated when the validators misbehave. The staked tokens are never transferred to the validators who they voted for. They are simply used as a proof of voting power and incentive for the token holders to choose responsible and capable validators to maintain the blockchain. The potential punishment solves the “nothing at stake” problem.
Once the validator candidate receives enough stake to make the top 19, it becomes a validator, and all its delegators start to receive block award (about every 10 seconds). The block award includes two parts:
- The system has an annual inflation rate of 8%. This inflation is distributed as newly minted CMTs to delegators.
- The delegators also receive transaction fees paid by heavy users of the blockchain.
The total block award from the system is first assigned to the delegators proportional to each delegator’s stake. The system then automatically distributes the block award to the validators and delegators based on the validator’s compensation rates.
From a validator side, he will receive block awards from two sources: the self-staked CMTs by validating blocks and its compensation from delegators for maintaining the network.
Already a dozen of high-profile candidates have announced their interests to become a Validator. To name a few: Susquehanna International Group, Great Voyage Capital, LinkVC, AlphaCoin Fund, Shuanghua Capital, IDG Capital.
CMT holders (delegators) stake their CMTs to the validator candidate. It is important to note that staked CMTs cannot be traded, and once staked, a delegator must request unstaking and then wait a week before he can trade them again.
The waiting period of unstaking is to guard against something called “long range double spend attack”.
When a validator becomes unavailable or produces results that are different from the rest of the validators, the system will slash and burn 0.1% of its total stake (i.e., the validator itself and all its delegators will lose CMTs) every block (every 10s). After 12 consecutive slashes, the system removes the validator and promotes the next validator candidate as a validator.
The removed validator will no longer suffer slashing loss, but none of its delegators will earn any block awards either. Its delegator can request to unstake from it, and then re-stake their CMTs after the one week unstake waiting period.
The CyberMiles protocol disincentives any validator from growing too big. If a single validator’s stake grows above 12% of total stake of the network, this validator could cause instability in the network. So, when the network assigns the block award, all its delegators will receive reduced block award for stakes that goes above the 12% threshold. This threshold incentivizes large CMT holders to diversify and stake in multiple validators, and it incentives validators to limit their max accepted stake. Algorithm to compute voting power for each validator is as follows.
- Distribute voting power to validators according to each validator’s stake amount, but capped at 12% for each. For example, if validator A has 5% of the outstanding stake, he gets 5% voting power; if validator B has 20% of the stake, he gets 12% voting power.
- If there is remaining voting power, distribute a second round based on actual stake amount of each validator.
Beyond the 19 official validators, there are validator candidates whose staked CMTs are less than the 19th validator. They are backup validators. There are always possibilities for the backup to accumulate enough stakes in the future to overtake the 19th validator. An existing validator might also be punished or simply withdraw, or stop functioning as a validator completely. In those cases, the backup becomes a validator, and the previous second candidate in line becomes the backup.
Backup validators do not earn CMT awards for the CMTs staked in them. They are typically new entrants into the ecosystem or opportunistic players. The Foundation will run multiple backup validator candidates in order to maintain the network stability.
One CMT Cube can hold up to 100,000 CMTs and the minimum amount is 1,000 CMTs.
The CMT Cube can be purchased here at 998 CMT starting on May 31. However, CyberMiles Foundation will refund 100% of the cost within 300 days.