One of the core problems blockchain was originally designed to solve was how to enable nodes distributed around the world to reach agreement on the same network state without relying on a centralized institution.

But as blockchain has evolved from early single-chain models toward DeFi, NFT, RWA, Rollup, and multi-chain ecosystems, the problem has become more complex.

When a blockchain needs to support more transactions, more users, and more applications, the consensus mechanism is no longer only about “how to reach agreement.” It must also find a better balance between security, decentralization, and efficiency.

This has driven the continuous evolution of consensus mechanisms.

I. From PoW to PoS: How Do Mainstream Consensus Mechanisms Solve the Trust Problem in Blockchain?

Different blockchains use different consensus designs, but they fundamentally address the same question: without a centralized administrator, who has the right to produce a block, and how can other nodes verify that the block is valid?

Today, the major consensus mechanisms include PoW, PoS, and BFT-based PoS mechanisms.

These approaches show that there is no single “perfect answer” for every blockchain.

PoW emphasizes establishing security costs through physical resources; PoS emphasizes establishing security constraints through economic staking; BFT-based mechanisms place greater emphasis on enabling validators to reach deterministic consensus quickly.

Different designs are essentially answering the same question:

How can a network without a centralized authority reach a consistent state more efficiently while maintaining security?

II. Consensus Mechanisms Are Evolving From “Security First” Toward “Security + Efficiency”

In the early days of blockchain, the primary question was whether a network could operate securely.

Bitcoin established a clear security model through PoW: attacking the network requires enormous computational and energy costs.

But as blockchain began to support larger-scale applications, simply increasing the cost of security could not solve every problem.

Large amounts of computation lead to higher operating costs, while transaction confirmation speed, throughput, and finality also become important considerations for large-scale applications.

As a result, the industry gradually moved toward PoS and BFT-based consensus mechanisms.

Behind this evolution is an important idea:

Instead of relying primarily on massive amounts of computation for network security, blockchain can use validators, staked assets, and multi-node voting to establish economic and consensus security.

This has led to several important directions in consensus design:

• Lower resource consumption: reducing reliance on large-scale computational power;

• Faster finality: confirming transactions more quickly and reducing waiting costs;

• Higher efficiency: using validator voting to reach consensus more rapidly;

• Greater scalability: enabling the consensus layer to work together with the execution layer, data availability layer, and other modules.

As blockchain moves further into the Rollup and modular era, consensus mechanisms are also changing.

The consensus layer no longer needs to handle all computation. Instead, it can focus more on transaction ordering, block production, and final confirmation of the network state.

This is the context behind ME Network’s adoption of a PPoS + ME-Tendermint consensus architecture.

III. How Does ME Network Rethink Consensus: PPoS + ME-Tendermint

ME Network does not simply adopt traditional PoS. Instead, it builds on the economic security model of PoS by introducing validator identity verification and governance-based admission mechanisms, forming Permitted Proof of Stake (PPoS).

At the same time, ME Network uses ME-Tendermint, a BFT consensus mechanism based on Tendermint / CometBFT, at the underlying layer to handle transaction ordering, block production, and final confirmation.

Simply put:

PPoS addresses “who can participate in consensus” and “how to establish economic and identity-based constraints,” while ME-Tendermint addresses “how participants can quickly reach agreement on blocks.”

Together, these two components form the underlying consensus system of ME Network.

1. PPoS: Moving From “Staking” Toward “Identity + Staking + Governance”

The core of traditional PoS is staking.

Validators need to stake the required assets and use economic costs to constrain their behavior. Validators that participate normally can receive incentives, while double signing, malicious behavior, or other violations of consensus rules may result in economic penalties such as Slashing.

ME Network further introduces a validator admission mechanism on this foundation.

In addition to meeting staking requirements, validators must complete identity verification and pass the relevant governance review before joining the validator set.

Therefore, PPoS can be understood as: economic constraints + trusted identity + governance-based admission.

This design means that validators are no longer simply anonymous addresses on the chain. Instead, they become network participants with verifiable identities and traceable responsibilities.

The core advantages of PPoS include:

• Trusted identity: Validators have verifiable identities, reducing risks associated with anonymous malicious nodes;

• Economic security: MEC staking and Slashing mechanisms increase the cost of malicious behavior;

• Governable participation: Validator admission and exit are managed through network governance;

• Compliance-friendly: Better suited to application scenarios such as digital identity and RWA that require trusted participants;

• Lower energy consumption: Does not rely on the large-scale computational competition required by PoW.

Therefore, the goal of PPoS is not simply to “limit validators,” but to explore a new balance between decentralization, security, and trusted participation.

2. ME-Tendermint: Enabling Faster Consensus

PPoS defines how validators participate, while actual block consensus is completed by ME-Tendermint.

ME-Tendermint is built on the Tendermint / CometBFT BFT consensus protocol. Its core approach is to use multiple rounds of validator voting to confirm blocks without relying on large-scale computational competition.

Once more than 2/3 of validator voting power agrees on the same block, that block can reach final confirmation.

This provides several important characteristics:

• Fast finality: Once consensus is reached, a block can be confirmed without waiting for a large number of subsequent blocks;

• High security: Under the BFT security assumptions, honest validators can maintain a consistent network state;

• High efficiency: Consensus is reached through validator voting, avoiding the large-scale computational competition of PoW;

• Modular support: The consensus layer is decoupled from the execution layer, settlement layer, and other functions, providing underlying security for modules such as RollApp.

This also reflects an important design principle of modular blockchain: let the consensus layer focus on “trust,” while other modules focus on “scaling.”

IV. How Does the ME Network Consensus Process Work?

Understanding a consensus mechanism requires more than knowing which algorithm it uses. It is also important to understand how a block moves from transactions to a final confirmed state.

The ME-Tendermint consensus process consists primarily of four stages:

1. Proposal

At the current block height and round, the designated Proposal Validator packages transactions and generates a candidate block.

The proposer then broadcasts the candidate block to other validators.

2. Pre-vote

After receiving the candidate block, other validators verify it, including:

• Whether the block format is correct;

• Whether the transactions are valid;

• Whether the block state complies with network rules;

• Whether the previous block state is correct.

If the block is valid, validators send a Pre-vote for the block.

If the block is invalid or a timeout occurs, validators may vote Nil.

3. Pre-commit

When a candidate block receives more than 2/3 of validator voting power in Pre-votes, validators enter the Pre-commit stage.

Validators confirm the block again and broadcast Pre-commit messages.

If sufficient consensus cannot be reached, the network moves to the next consensus round.

4. Commit

When a block receives more than 2/3 of validator voting power in Pre-commits, the network enters the Commit stage.

Once the block is committed: the block state is officially written on-chain, final confirmation is achieved, and the network moves to the next block height.

Once a block completes Commit, it has finality and does not require multiple subsequent blocks for further confirmation.

This mechanism enables ME Network to complete block confirmation through multiple validators without relying on massive computational power.

Conclusion | The Next Step for Consensus Is Finding a New Balance

From PoW to PoS and then to BFT-based consensus mechanisms, the evolution of blockchain consensus has always revolved around the same question:

How can blockchain become larger, faster, and more complex while remaining secure and trustworthy?

PoW establishes security through computational costs, PoS establishes security constraints through economic staking, while BFT-based consensus mechanisms further improve block confirmation efficiency and finality.

ME Network’s exploration builds on these approaches by combining identity, staking, governance, and BFT consensus.

PPoS establishes a trusted validator participation mechanism, ME-Tendermint enables rapid network consensus, while the modular architecture allows the consensus layer to work together with Rollup, data availability, and other network modules.

This is not simply a choice of consensus algorithm. It reflects ME Network’s broader understanding of next-generation Web3 infrastructure:

The future of blockchain is not simply about pursuing higher TPS. It is about establishing a sustainable long-term balance between security, decentralization, efficiency, trusted identity, and scalability.

As blockchain moves toward mass adoption, consensus mechanisms must evolve from simply “making blockchain work” to enabling blockchain to securely, efficiently, and sustainably support a much larger world.

This is the direction ME Network continues to explore.

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About Meta Earth

Meta Earth (ME) is based on a modular, high-performance, infinitely scalable multi-dimensional fusion underlying value network — ME Network, which supports the high-concurrency big data processing needs of traditional industrial applications.And through an encrypted DID (Decentralized Identifier) system — ME ID & ME Pass which can effectively protect user privacy data, and a co-construction & co-governance mechanism which can fully reflect personal sovereignty and equality for all, as well as an economic model which can guarantee UBI (Unconditional Basic Income) without any distinction, Meta Earth is fully dedicated to enhancing happiness for a better life and maintaining ecological balance to promotesustainability.

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