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Home»Blockchain»What is finality in blockchain, and why does it matter?
Blockchain

What is finality in blockchain, and why does it matter?

2023-10-09No Comments7 Mins Read
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Understanding the finality of blockchain

Finality in blockchain refers to the immutable confirmation of a transaction or block of transactions.

In conventional financial systems, once a transaction has been confirmed it cannot be undone. Likewise, achieving finality on a blockchain network ensures that a transaction is permanent and cannot be changed once it has been added to the blockchain. For the blockchain to be secure and authentic, this concept is crucial.

Finality is achieved through the blockchain network’s use of consensus. Different blockchain networks use different consensus algorithms, each with a unique method to validate transactions and ensure finality, such as proof-of-work (PoW), proof-of-stake (PoS) or practical Byzantine fault tolerance.

Types of finality in blockchain

Finality in blockchain can be probabilistic, economic, instantaneous, unconditional, or related to the entire state of the blockchain.

On the blockchain, there are different types of finality, each describing a clear degree of certainty and irreversibility regarding transactions and blocks. The main finality types on blockchain are as follows:

Probabilistic finality

Finality is probabilistic in most blockchain systems, especially those that use PoW consensus, such as Bitcoin. The chance of a transaction being rolled back decreases exponentially when blocks are placed on top of a confirmed transaction after it has been included in a block.

Economic finality

The economic finality concept is often associated with PoS systems. A transaction is considered final in terms of economic finality if it would not be financially viable to reverse it. In PoS, validators or nodes are required to collateralize a stake, a specific amount of cryptocurrency. If they approve fake transactions, they risk losing their stake, making it economically irrational to act maliciously.

Immediate finality

The Ripple network provides near-instant finality, ensuring that once a transaction is committed to the ledger, it is immediately confirmed and irreversible. Transactions are validated by 150 validators. These validators can potentially earn a spot on Ripple’s Unique Node List, which consists of 35 validators.

Unconditional finality

When a transaction is confirmed, it is deemed to be completely and unconditionally final. Under no circumstances can the transaction be reversed. Achieving unconditional finality can be difficult and often calls for a strong degree of centralization or a unique consensus method.

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Finality of state

In some blockchain systems, finality refers to the entire state of the blockchain, not just transactions. A state transition (a change in the state of the blockchain, such as a transaction or the execution of a smart contract) cannot be changed or undone once it is completed. For applications such as smart contracts, where the accuracy of the entire application state is critical, achieving state finality is essential.

Why finality is important in blockchain

Finality in blockchain provides the necessary assurance of the validity and durability of transactions, making it a fundamental concept for the reliability and functionality of the technology.

Finality provides a high level of security and trust in the system, ensuring that a transaction once confirmed cannot be changed or undone. By verifying that the transaction is legitimate and recorded on the blockchain, finality prevents the problem of double spending, where the same digital asset can be used more than once.

For example, double spending can occur if someone has one Bitcoin (BTC) and tries to send it to two different recipients in two separate transactions. By guaranteeing finality, blockchain technology prevents this from happening. Once a transaction is confirmed and recorded on the blockchain, the digital asset is considered spent and cannot be used for further transactions.

Finality is crucial in the context of smart contracts. The details of the agreement between the buyer and the seller are embedded directly into smart contracts, which are self-executing code. Finality guarantees that the outcomes of these contracts are deterministic and unchangeable.

Moreover, it is definitive how decentralized applications (DApps) ensure that their operations are secure and reliable. Finality ensures that decisions and transactions within these applications are immutable and irreversible. Furthermore, the blockchain develops trust among the users and members of the network by making transactions final. Users’ confidence in the system is increased because they know that transactions are irreversible.

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Challenges to achieving finality in blockchain

Issues such as forking, network latency, smart contract vulnerabilities, and 51% attacks prevent blockchain transactions from becoming final.

When the blockchain splits into different paths, forking occurs, creating different versions of the transaction history. The consensus method is challenged by this divergence, making it difficult to determine which version is the legitimate one and delaying finality.

For example, hard forks can be the result of community or developer disagreements over protocol updates. Until the issue is resolved, various factions may continue to support PoW blockchains, resulting in a lack of finality.

Network latency, or the delay in data communications between nodes, further complicates matters. Slow network connections can cause errors in transaction sequencing and validation by slowing the spread of transaction information across the blockchain network.

Furthermore, the vulnerability of a smart contract can result in unexpected behavior, allowing bad actors to take advantage and reverse transactions. Similarly, in a PoW blockchain, an entity that has more than 50% of the network’s mining power may be able to change the blockchain’s history and reverse transactions. This undermines finality and safety.

As a result of these concerns, the integrity of the blockchain is at risk, necessitating the implementation of strong consensus algorithms and effective network protocols by developers to reduce forking and latency issues and ensure the timely and secure finality of transactions.

Techniques and consensus algorithms to increase finality

Longer confirmation periods, multiple validations, and advanced security algorithms, such as Algorand’s Pure PoS, delegated PoS (DPoS), and HoneyBadgerBFT, can help improve blockchain finality.

One approach includes longer confirmation times, allowing for a greater number of validations before a transaction is considered final. The likelihood that the validity of a transaction will be confirmed and become irreversible is greatly increased by increasing the time required to reach consensus.

Additionally, using the multiple confirmation technique, where transactions are verified by many nodes or validators, provides an additional layer of security, ensuring broader consensus and reducing the chance of errors or malicious attacks.

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Additionally, innovative consensus algorithms such as Algorand’s Pure PoS, DPoS and HoneyBadgerBFT have transformed the industry. Algorand uses a PoS method in combination with a Byzantine agreement protocol to ensure fast and irreversible finality of transactions.

By implementing a reputation-based system where a small group of trusted delegates validate transactions, DPoS increases the effectiveness and finality of the network. Similarly, the HoneyBadgerBFT algorithm improves finality and security even in the presence of malicious nodes or network delays by achieving asynchronous Byzantine consensus.

Future trends and developments in achieving faster and more reliable finality

Essentially, a multidisciplinary strategy that includes various consensus techniques, advanced encryption and improved interoperability is necessary to achieve faster and more reliable finality in the future.

Exposure to hybrid consensus models is one such trend. These hybrid consensus algorithms aim to increase scalability and performance while maintaining strong security by combining the benefits of different consensus algorithms. Projects have experimented with integrating PoS methods as they consume significantly less energy than PoW techniques and speed up confirmation times.

In addition, there is growing interest in advanced cryptographic methods such as zero-knowledge (ZK) proofs and innovative technologies such as sharding. Zero-knowledge proofs improve efficiency and privacy by allowing parties to validate transactions without revealing private information. Sharding, a method of dividing the blockchain into smaller, more manageable parts, reduces the computational burden on nodes and speeds up transaction processing.

The development of quantum computing could make existing encryption techniques obsolete, necessitating the creation of quantum-resistant algorithms. To maintain the security and finality of transactions in the face of quantum threats, blockchain networks are actively exploring quantum-resistant cryptographic solutions.

Another area of ​​interest is how different blockchains interact with each other. Using protocols like Polkadot and Cosmos, transactions between networks can be completed quickly and seamlessly. This interoperability improves the overall effectiveness of blockchain systems, resulting in faster and more reliable finality.

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