Proof-of-Stake (PoS) is rapidly becoming a dominant consensus mechanism in the cryptocurrency world, offering a more energy-efficient alternative to Proof-of-Work. Several leading cryptocurrencies leverage PoS, resulting in faster transaction speeds and lower environmental impact. Here are some of the top PoS coins by market capitalization:
Ethereum (ETH): A pioneer in transitioning to PoS via the “Merge,” Ethereum now boasts significantly reduced energy consumption and improved scalability. Its smart contract capabilities remain a cornerstone of the DeFi and NFT ecosystems.
BNB (BNB): The native token of the Binance exchange, BNB benefits from the massive trading volume and utility within the Binance ecosystem. Its PoS mechanism contributes to network stability and fast transaction processing.
Solana (SOL): Known for its exceptionally high transaction throughput, Solana utilizes a unique hybrid PoS consensus mechanism. This allows for rapid transaction speeds, making it a popular choice for decentralized applications.
Cardano (ADA): Focusing on research and peer-reviewed academic work, Cardano’s Ouroboros PoS protocol emphasizes security and scalability. Its layered architecture allows for ongoing upgrades and improvements to the network.
Important Note: Market capitalization is constantly fluctuating. Always conduct thorough research before investing in any cryptocurrency. The information provided here is for educational purposes and should not be considered financial advice.
Is ethereum a PoS or PoW?
Ethereum’s transition to proof-of-stake (PoS) is a landmark event in the cryptocurrency world. Before September 2025, Ethereum relied on proof-of-work (PoW), a system notorious for its high energy consumption. The switch to PoS dramatically reduced its environmental impact.
What is Proof-of-Stake? In PoS, validators are chosen to propose and verify blocks based on the amount of ETH they hold, known as their “stake.” This contrasts with PoW, where miners compete to solve complex mathematical problems to validate transactions.
How does staking work on Ethereum?
- Becoming a Validator: To become a full validator, you need to lock up 32 ETH. This ETH is not lost, but it is locked for the duration of your participation.
- Delegated Staking: If you don’t have 32 ETH, you can still participate in the network by delegating your ETH to a validator. You earn rewards based on the validator’s performance, but you relinquish control over your staked ETH.
- Staking Pools: Staking pools aggregate the ETH of multiple users to reach the 32 ETH threshold required for validation. This offers a way for smaller stakeholders to participate and share the rewards.
Benefits of PoS:
- Reduced Energy Consumption: PoS is significantly more energy-efficient than PoW.
- Increased Security: The high barrier to entry (32 ETH stake) helps to deter malicious actors from attacking the network.
- Improved Scalability: PoS can potentially handle a larger number of transactions per second compared to PoW.
Risks of Staking:
- Loss of staked ETH: In case of validator misbehavior, there is a risk of losing some or all of your staked ETH.
- Slashing penalties: Penalties can be imposed on validators who act maliciously or fail to perform their duties correctly.
- Impermanent Loss (with liquidity pools): While not directly related to staking, using staking rewards to participate in liquidity pools can lead to impermanent loss if the price of the assets changes.
In summary: Ethereum’s transition to PoS represents a major upgrade, significantly enhancing its sustainability, security, and scalability. However, understanding the risks associated with staking is crucial before participating.
Is Cardano proof of stake?
Cardano uses a system called Proof-of-Stake (PoS). This means that instead of using lots of energy to solve complex math problems like Bitcoin (which uses Proof-of-Work), Cardano validators are chosen based on how many ADA coins they hold. The more ADA you stake, the higher your chance of validating transactions and earning rewards.
Think of it like this: In Proof-of-Work, miners compete to solve puzzles. In Proof-of-Stake, validators are selected randomly, weighted by the amount of ADA they’ve locked up. This makes Cardano much more energy-efficient than Bitcoin.
Why is this important? PoS is considered more environmentally friendly and sustainable. It also generally leads to lower transaction fees and faster transaction times compared to PoW blockchains.
ADA is the cryptocurrency used on the Cardano blockchain. You need ADA to participate in staking and earn rewards.
What cryptos are proof of work?
Bitcoin, the undisputed king of crypto, famously utilizes the Proof-of-Work (PoW) consensus mechanism. This energy-intensive process secures the network by requiring miners to solve complex computational puzzles to validate transactions and add new blocks to the blockchain. However, Bitcoin isn’t alone in its reliance on PoW.
Litecoin, often considered Bitcoin’s “silver” to Bitcoin’s “gold,” shares the PoW algorithm, offering faster transaction speeds and a different coin supply model. Dogecoin, the meme-inspired cryptocurrency, also employs PoW, highlighting its surprising longevity and community strength despite its initially lighthearted nature. Bitcoin Cash, a hard fork of Bitcoin, maintains the PoW consensus but prioritizes larger block sizes for enhanced scalability.
Zcash uses PoW to protect the privacy of its users’ transaction details, employing zk-SNARKs (zero-knowledge Succinct Non-Interactive Arguments of Knowledge) for enhanced anonymity. Siacoin, a decentralized cloud storage platform, leverages PoW to incentivize storage providers and maintain the integrity of its distributed network. It’s crucial to note that while Monero is often mentioned alongside PoW coins, it actually uses a unique, ring-signature based algorithm, not a traditional PoW system.
While PoW offers strong security, its high energy consumption remains a significant point of contention. The ongoing debate about the environmental impact of PoW continues to drive innovation in the development of alternative consensus mechanisms, such as Proof-of-Stake.
What is the largest proof-of-stake crypto?
The biggest proof-of-stake (PoS) cryptocurrency is Ethereum (ETH). This means it has the highest market capitalization among all cryptocurrencies that use the PoS consensus mechanism.
Proof-of-Stake is a way of verifying transactions and adding new blocks to the blockchain. Unlike Proof-of-Work (like Bitcoin), which requires lots of energy to solve complex math problems, PoS is more energy-efficient. In PoS, validators are chosen based on the amount of cryptocurrency they hold (their “stake”). The more ETH you stake, the higher your chance of being selected to validate transactions and earn rewards.
Market capitalization is simply the total value of all the coins in circulation. It’s calculated by multiplying the current price of the coin by the total number of coins in existence. A higher market cap generally indicates a larger and more established cryptocurrency, though it’s not the only factor to consider.
Ethereum’s transition to PoS was a significant event in the crypto world. Before 2025, Ethereum used Proof-of-Work, but the switch to PoS made it significantly more environmentally friendly and improved transaction speeds and efficiency.
Disclaimer: Information provided is for educational purposes only and does not constitute financial advice. Always conduct thorough research before investing in any cryptocurrency.
Is XLM proof-of-stake?
XLM utilizes the Stellar Consensus Protocol (SCP), a novel distributed consensus mechanism distinct from both Proof-of-Work (PoW) and Proof-of-Stake (PoS). It’s a federated Byzantine agreement algorithm, meaning it achieves consensus through a network of trusted nodes.
Key differences from PoW and PoS:
- No Mining: Unlike PoW, SCP doesn’t rely on computationally intensive mining to validate transactions, making it significantly more energy-efficient.
- No Staking (in the traditional sense): While participation requires holding XLM, it’s not a direct staking mechanism like PoS where rewards are proportional to stake size. Instead, node operators are chosen based on a variety of factors including reputation and network connectivity. The system incentivizes reliable participation and penalizes malicious behavior.
How SCP works:
- The network is composed of nodes, each holding a copy of the ledger.
- Transactions are broadcast to the network.
- Nodes form quorum slices (subsets of nodes) to reach consensus on the validity of transactions using a sophisticated algorithm resistant to Byzantine failures (malicious or faulty nodes).
- Once a quorum slice agrees on a transaction, it’s added to the ledger, ensuring consistency across the network.
Advantages of SCP:
- High throughput and low latency: SCP is designed for speed and efficiency, allowing for fast transaction processing.
- Scalability: The quorum slice mechanism enables the network to scale effectively as the number of nodes increases.
- Security: The Byzantine fault tolerance mechanism ensures the network’s resilience to attacks.
- Energy efficiency: Significantly lower energy consumption compared to PoW systems.
Considerations: While SCP offers several advantages, the reliance on a federated network of trusted nodes introduces a degree of centralization compared to fully decentralized PoS systems. The selection and governance of these nodes are crucial for maintaining the network’s security and trust. The long-term evolution of the Stellar network and its governance model remain important aspects to follow.
Is XRP proof-of-stake?
No, XRP is not a proof-of-stake (PoS) cryptocurrency. It utilizes a unique consensus mechanism called the XRP Ledger (XRPL), operating on a permissioned, federated model. This differs significantly from PoW (Bitcoin) and PoS (Ethereum) which rely on miners or validators staking their assets to secure the network. The XRPL instead relies on a network of trusted validators who maintain and validate transactions. This approach prioritizes speed and efficiency, resulting in significantly lower transaction fees and faster confirmation times compared to PoW or even many PoS systems. While this model has advantages in terms of speed and cost, it also raises concerns about decentralization and censorship resistance compared to fully permissionless networks.
Key takeaway: Think of it as a hybrid approach. It’s not truly decentralized in the same way as Bitcoin or Ethereum, but its speed and efficiency make it attractive for specific applications like cross-border payments. The ‘trusted validators’ aspect is a crucial differentiator and something investors should carefully consider.
Important Note: The regulatory uncertainty surrounding XRP adds significant risk. Its classification as a security is still a matter of ongoing legal debate which greatly impacts its investment profile.
Is Cardano proof-of-work?
No, Cardano does not use a proof-of-work (PoW) consensus mechanism. It employs a unique proof-of-stake (PoS) protocol called Ouroboros. This is a significant departure from early cryptocurrencies like Bitcoin, which relied on PoW, and even Ethereum, which transitioned from PoW to PoS (specifically, to a PoS mechanism called Beacon Chain) in 2025.
Key differences between PoW and PoS, particularly relevant to Cardano’s Ouroboros:
- Energy Consumption: PoW requires vast computational power, leading to significant energy consumption. PoS, like Ouroboros, drastically reduces energy usage by validating transactions based on stake rather than computational power.
- Security Model: While both offer security, their approaches differ. PoW relies on the difficulty of solving complex computational puzzles. PoS secures the network by penalizing validators for malicious behavior and rewarding them for honest participation, making it more resilient against 51% attacks with less energy than PoW.
- Transaction Speed and Scalability: Ouroboros is designed for higher transaction throughput and scalability compared to many PoW systems. This is achieved through various optimizations within the Ouroboros protocol itself, including the use of slots and committees.
- Decentralization: The level of decentralization is a complex issue debated in both PoW and PoS systems. Ouroboros aims for high decentralization by distributing stake across many participants, but achieving perfect decentralization is a challenge for both models.
Ouroboros’s unique features:
- Formal Verification: Ouroboros has undergone formal verification, a rigorous mathematical process to prove its security properties, providing a higher level of assurance compared to many other protocols.
- Slot-Based Architecture: Ouroboros employs a slot-based architecture, allowing for regular, predictable block creation, improving the efficiency of the network.
- Leader Selection: The selection of block proposers (validators) in Ouroboros is based on a cryptographic lottery weighted by stake, ensuring fairness and preventing centralization.
In summary, Cardano’s choice of Ouroboros offers a compelling alternative to PoW, addressing scalability and energy efficiency concerns while maintaining a robust security model.
Is polkadot a PoS?
Yep, Polkadot (DOT) is a Proof-of-Stake (PoS) blockchain, but it’s a nominated Proof-of-Stake, which is a bit different from some other PoS systems. This means you don’t stake directly; instead, you nominate validators to secure the network. This is more efficient and arguably safer.
The real kicker with Polkadot is its parachain architecture. Think of it as a multi-chain system where independent blockchains (parachains) connect to a central relay chain. This allows for massively improved scalability compared to single-chain blockchains like Ethereum. Each parachain can focus on a specific application or niche, creating a whole ecosystem of interconnected blockchains.
The interoperability aspect is key here. Polkadot’s bridges allow these parachains (and even other blockchains!) to communicate and exchange data, leading to potentially huge synergies and new applications. This is a major advantage and a big reason why many see Polkadot as a strong contender in the long-term crypto landscape. It’s less about simply being PoS and more about the innovative architecture unlocking true scalability and interoperability.
Staking DOT is relatively straightforward and offers rewards. However, remember that crypto investments always carry risk. Do your own research before investing.
Is polkadot a PoS or PoW?
Polkadot’s consensus mechanism isn’t simply Proof-of-Stake (PoS); it’s a more sophisticated variant called Nominated Proof-of-Stake (NPoS). This is a key differentiator, offering several advantages over standard PoS.
Instead of all token holders directly validating transactions, NPoS introduces two crucial roles:
- Validators: These are the individuals or entities responsible for verifying and adding new blocks to the Polkadot chain. They stake their DOT tokens, essentially putting their money where their mouth is, to secure the network. Malicious behavior results in slashing—losing a portion or all of their staked DOT.
- Nominators: These are DOT holders who choose which validators they trust to secure the network. They stake their DOT to support their chosen validators. Nominators earn rewards based on the performance of the validators they nominated.
This two-tiered system enhances security in several ways:
- Reduced centralization risk: Unlike some PoS systems where a small number of wealthy entities could dominate validation, NPoS allows for a more decentralized validator set due to the nominator system.
- Increased security through accountability: Validators are accountable not only to the network but also to their nominators. Poor performance can lead to nominators switching their support, reducing the validator’s influence.
- More efficient validation: The NPoS model limits the number of validators required to reach consensus, which is more efficient compared to directly including all token holders.
This nuanced approach to consensus, distinguishing it from Proof-of-Work (PoW) and simpler PoS systems, underscores Polkadot’s commitment to robust security and efficient network operation. The combination of validator and nominator roles creates a dynamic and self-regulating ecosystem.
Is XRP proof-of-work?
No, XRP isn’t proof-of-work. It uses a unique consensus mechanism called the XRP Ledger (XRPL) consensus. Forget the energy-intensive mining of Bitcoin and Ethereum; XRPL validators reach consensus incredibly fast – every 3-5 seconds. This speed is a key differentiator, leading to significantly lower transaction fees and faster settlement times compared to PoW or even many PoS systems.
Instead of miners competing to solve complex cryptographic puzzles, XRPL validators are selected from a large, decentralized pool. These validators are incentivized to act honestly and maintain the integrity of the ledger through a system of rewards and penalties. This unique approach offers a highly scalable and energy-efficient alternative to traditional blockchain consensus mechanisms. It’s worth noting that the energy efficiency is a significant advantage in a world increasingly focused on sustainability.
This speed and efficiency aren’t just theoretical benefits; they translate to real-world applications. Think about microtransactions, cross-border payments, or even decentralized exchanges – the XRPL’s speed makes it a compelling option for these use cases. Understanding the nuances of XRP’s consensus mechanism is crucial for appreciating its potential.
Is XRP PoW or PoS?
XRP’s underlying technology, the XRP Ledger, employs a unique consensus mechanism that sets it apart from the dominant Proof-of-Work (PoW) and Proof-of-Stake (PoS) models. It doesn’t rely on energy-intensive mining like Bitcoin (PoW) or stake-weighted voting like many altcoins (PoS).
Instead, the XRP Ledger uses a consensus by federation. This involves a network of independent validators, often referred to as “unique nodes”, who maintain and secure the ledger. These validators don’t “mine” or “stake” in the traditional sense. They’re selected based on various factors, including their reputation and uptime, and work together to validate transactions. This process ensures the integrity and security of the network.
This unique approach results in significantly faster transaction speeds compared to PoW and many PoS systems. Transactions are confirmed within approximately 3-5 seconds, making XRP well-suited for real-time payments and other applications requiring immediate settlement.
A crucial difference is the lack of mining rewards in the XRP Ledger. Validators are not rewarded with newly minted XRP for their work. Instead, they are incentivized through other means, such as transaction fees and participation in the network’s overall health and security. This contributes to a more stable and less volatile ecosystem compared to systems that rely on constantly inflating coin supplies through mining rewards.
The XRP Ledger’s consensus mechanism aims to balance decentralization with speed and efficiency. While the validator network isn’t as decentralized as some PoW systems, the constantly evolving and rotating nature of the validator set strives to mitigate potential centralization risks.
The scalability of the XRP Ledger is another key advantage, enabled by its unique consensus method. The fast transaction times and low energy consumption allow for high throughput, making it a contender in the realm of high-volume payment processing. Understanding this alternative consensus approach is crucial for grasping XRP’s capabilities and its place within the broader cryptocurrency landscape.
Which cryptocurrencies use PoW?
While Siacoin, Dash, and Zcash currently employ Proof-of-Work (PoW), their recent performance (-0.52%, -0.88%, -2.63% respectively) doesn’t tell the whole story. PoW’s inherent energy consumption remains a significant drawback, facing increasing scrutiny and potential regulatory hurdles. Siacoin’s decentralized storage focus offers a unique angle, though its market cap limits its influence. Dash, with its instant transactions and privateSend feature, targets a niche market, but faces competition from faster, more scalable alternatives. Zcash, prioritizing privacy through zk-SNARKs, holds a strong position in the privacy coin sector, but faces challenges from newer privacy-focused protocols. The PoW landscape is evolving rapidly, with newer, more efficient consensus mechanisms gaining traction. Consider diversifying beyond purely PoW assets to mitigate risk and exposure to energy consumption concerns. Fundamental analysis, rather than short-term price fluctuations, should guide investment decisions.
Is Cardano a PoS?
Yes, Cardano is a proof-of-stake (PoS) cryptocurrency. This means it uses a different way of verifying transactions than older cryptocurrencies like Bitcoin. Bitcoin uses proof-of-work (PoW), which requires a massive amount of energy to secure the network through complex calculations.
Cardano’s PoS system, called Ouroboros, is much more energy-efficient. Instead of solving complex math problems, it lets users “stake” their Cardano (ADA) tokens to validate transactions. The more ADA you stake, the higher your chance of being selected to validate a block and earn rewards. This makes it a more sustainable and environmentally friendly blockchain.
Key difference: PoW is like a competition where miners race to solve problems; PoS is more like a lottery where stakers are randomly selected.
Important note: Ethereum, another major cryptocurrency, also transitioned from PoW to PoS (specifically, a version called Proof-of-Stake) in 2025, significantly reducing its energy consumption.
In short: Cardano’s PoS mechanism offers a greener and more efficient way to secure its blockchain compared to older PoW systems.
Is Filecoin a PoS or PoW?
Filecoin’s consensus mechanism isn’t a simple PoS or PoW. It’s more nuanced. While it leverages aspects reminiscent of PoS, its core functionality revolves around a unique proof-of-replication (PoRep) and proof-of-spacetime (PoSt) system.
PoRep ensures that storage providers genuinely commit data to their storage systems, preventing cheating by simply claiming storage without actually having it. Think of it as a cryptographic proof of work specifically for data storage. It’s computationally intensive, yet significantly different from Bitcoin’s PoW.
PoSt, on the other hand, acts as a recurring verification that the data remains stored consistently over time. This is crucial for maintaining data availability and the integrity of the network. This differs greatly from the simple stake-based validation found in pure PoS blockchains.
The economics of Filecoin reward participants for providing and verifying storage, creating an incentive structure that drives network decentralization. This is a key differentiator. It’s not just about validating transactions like in typical PoS; it’s about securing and maintaining a massive decentralized storage network.
Therefore, while superficial comparisons might draw parallels to PoS, Filecoin operates on a fundamentally different, and arguably more complex, mechanism optimized for its intended purpose: secure, decentralized data storage. Its unique approach is what makes Filecoin truly groundbreaking. It’s not just a blockchain; it’s a whole new paradigm for data management.
- Key Differences from PoS: Filecoin isn’t about staking tokens for validation rights. Instead, it’s about staking storage capacity and proving its continuous availability.
- Key Differences from PoW: While PoRep involves computational effort, it’s directed specifically at data storage verification, not general-purpose hashing as in traditional PoW systems.
Does XRP use PoW or PoS?
XRP employs a unique consensus mechanism, the Ripple Protocol Consensus Algorithm (RPCA), differentiating it significantly from the Proof-of-Work (PoW) used by Bitcoin and the Proof-of-Stake (PoS) utilized by many other cryptocurrencies like Ethereum. This isn’t simply a variation on existing methods; it’s fundamentally different.
Key distinctions of RPCA:
- Centralized Validators: Unlike PoW’s decentralized mining or PoS’s distributed validator network, RPCA relies on a network of trusted validators. This allows for faster transaction speeds and lower energy consumption.
- Focus on Transaction Finality: RPCA prioritizes near-instant transaction finality, a crucial advantage for practical applications demanding speed and certainty.
- Scalability: Designed for high throughput, RPCA aims to handle a large volume of transactions efficiently, exceeding the capabilities of many PoW and even some PoS networks.
- Energy Efficiency: The centralized nature of RPCA contributes to significantly lower energy consumption compared to PoW consensus.
Potential Drawbacks:
- Centralization Concerns: The reliance on a network of trusted validators raises concerns about decentralization and potential vulnerabilities to manipulation or censorship.
- Regulatory Scrutiny: The centralized aspect of RPCA has subjected XRP to increased regulatory scrutiny, resulting in legal challenges and uncertainties regarding its classification.
In summary: RPCA offers unique advantages in terms of speed, scalability, and energy efficiency but also faces challenges related to decentralization and regulatory compliance, representing a trade-off not present in PoW or PoS systems.
Is Solana proof-of-work?
No, Solana is not a proof-of-work (PoW) blockchain. It utilizes a novel consensus mechanism called Proof of History (PoH).
Proof of History (PoH) is a cryptographic mechanism that allows Solana to achieve high throughput and low latency. Unlike PoW, which relies on computationally intensive hashing to secure the blockchain, PoH establishes a verifiable, cryptographically secure record of time elapsed between events. This is achieved through a verifiable delay function (VDF), a cryptographic function that takes a significant amount of time to compute, but whose output can be verified quickly.
Here’s how it differs from PoW and PoS:
- PoW: Relies on miners competing to solve complex mathematical problems. Energy-intensive and slow transaction times.
- PoS: Validators are chosen based on their stake in the network. While more energy-efficient than PoW, it can still face scalability challenges.
- PoH: Establishes a verifiable timeline of events, allowing for efficient ordering and processing of transactions, significantly improving throughput without relying on computationally expensive processes.
Benefits of PoH in Solana:
- High Throughput: Solana’s PoH allows for thousands of transactions per second.
- Low Latency: Transaction confirmation times are significantly faster compared to PoW or PoS blockchains.
- Improved Scalability: The verifiable timeline allows for efficient parallel processing of transactions.
- Reduced Energy Consumption: Compared to PoW, PoH is significantly more energy-efficient.
Important Note: While PoH provides significant advantages, it’s not without its challenges. Security and decentralization remain ongoing areas of research and development for PoH-based blockchains.
Is Cardano a PoS or PoW?
Cardano employs a unique Ouroboros proof-of-stake consensus mechanism, a variant of PoS designed for enhanced security and scalability. Unlike Bitcoin’s energy-intensive proof-of-work, Ouroboros achieves consensus through stake-weighted voting, significantly reducing Cardano’s environmental footprint. This mechanism selects validators (stake pool operators) proportionally to the ADA they stake, ensuring a decentralized and secure network. The Ouroboros family of protocols, including Ouroboros Praos and Ouroboros Genesis, have undergone rigorous academic peer review, a key differentiator compared to many other PoS blockchains. This focus on formal verification and academic rigor contributes to Cardano’s robust security model. Furthermore, Cardano’s layered architecture separates the settlement layer (Cardano blockchain) from the computation layer (Plutus smart contracts), enabling improved scalability and facilitating the development of complex decentralized applications (dApps). This design allows for independent upgrades and enhancements to each layer without compromising the overall system’s integrity.
Is Polkadot a PoS or POW?
Polkadot leverages a unique consensus mechanism: Nominated Proof-of-Stake (NPoS). Forget the energy-intensive Proof-of-Work (PoW) – Polkadot’s NPoS is far more efficient and environmentally friendly.
Here’s the breakdown:
- Validators: These are the nodes actively securing the network and processing transactions. Think of them as the backbone of Polkadot’s operation.
- Nominators: These users stake their DOT tokens to select validators. They’re essentially voting for the most trustworthy and reliable nodes. This ensures a decentralized and robust validator set.
This two-tiered system is key. Nominators earn rewards for their participation, while validators receive rewards for their work. This incentivizes both groups to act honestly and efficiently, contributing to the overall security and stability of the network. It’s a sophisticated system designed to maximize chain security while minimizing resource consumption.
Unlike simpler PoS models, NPoS’s nomination process adds a layer of decentralization. It prevents a few powerful entities from dominating the validator set. This is crucial for long-term resilience and resistance to attacks.
Key advantages of NPoS over traditional PoS:
- Enhanced security through a more distributed validator selection process.
- Greater participation and rewards for a wider range of users.
- Reduced energy consumption compared to PoW.
Ultimately, NPoS is a crucial component of Polkadot’s innovative architecture, delivering a secure, efficient, and sustainable blockchain.