# What Is Transaction Finality in PoS? ⎊ Path

**Published:** 2025-12-04
**Author:** Greeks.live
**Categories:** Path

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## What Is Transaction Finality in PoS?

Transaction finality is the guarantee that a transaction cannot be reversed once it has been included in the blockchain. In PoS, finality is often achieved through a two-step voting process by a supermajority of validators, after which the transaction is considered irreversible without a catastrophic and extremely costly attack (e.g. losing all staked capital).

- [Does Proof-of-Stake (PoS) Achieve Finality Differently than PoW?](https://learn.greeks.live/path/does-proof-of-stake-pos-achieve-finality-differently-than-pow/)

- [Which Is Generally Faster, PoW or PoS Finality?](https://learn.greeks.live/path/which-is-generally-faster-pow-or-pos-finality/)

- [How Does the ‘Supermajority’ Concept Work in PoS Finality?](https://learn.greeks.live/path/how-does-the-supermajority-concept-work-in-pos-finality/)

- [How Do ‘Byzantine Fault Tolerance’ (BFT) Consensus Mechanisms Offer Stronger Finality?](https://learn.greeks.live/path/how-do-byzantine-fault-tolerance-bft-consensus-mechanisms-offer-stronger-finality/)

- [What Mechanisms Are in Place to Prevent Validator Collusion in PoS?](https://learn.greeks.live/path/what-mechanisms-are-in-place-to-prevent-validator-collusion-in-pos/)

- [How Does the Concept of “Epoch” Relate to PoS Finality?](https://learn.greeks.live/path/how-does-the-concept-of-epoch-relate-to-pos-finality/)

- [How Does ‘Finality’ Address the Double-Spending Problem in Proof-of-Stake?](https://learn.greeks.live/path/how-does-finality-address-the-double-spending-problem-in-proof-of-stake/)

- [Explain the Concept of “Finality” in a PoS Blockchain](https://learn.greeks.live/path/explain-the-concept-of-finality-in-a-pos-blockchain/)

## Glossar

### [Transaction Finality](https://learn.greeks.live/area/transaction-finality/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Principle ⎊ Transaction finality is the principle that once a transaction is recorded on a blockchain, it cannot be reversed, altered, or canceled, providing absolute and irreversible settlement assurance.

### [Supermajority Vote](https://learn.greeks.live/area/supermajority-vote/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Threshold ⎊ A Supermajority Vote refers to a governance requirement where a significant fraction, often greater than a simple majority, of token holders or staked value must affirmatively agree to a proposal before it can be enacted on the blockchain.

## Discover More

### [How Does the Concept of "Economic Finality" Differ from "Cryptographic Finality"?](https://learn.greeks.live/path/how-does-the-concept-of-economic-finality-differ-from-cryptographic-finality/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![How Does the Concept of "Economic Finality" Differ from "Cryptographic Finality"?](https://learn.greeks.live/wp-content/uploads/2025/10/Reflective-Digital-Storage-Medium-Resting-Upon-Advanced-Black-Circuitry-Substrate-Awaiting-Tokenization.webp)

Cryptographic finality is probabilistic (PoW) and based on computational cost; economic finality is deterministic (PoS) and based on the financial cost of slashing.

### [How Can a Decentralized Exchange (DEX) Leverage Finality for Better Execution?](https://learn.greeks.live/path/how-can-a-decentralized-exchange-dex-leverage-finality-for-better-execution/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![How Can a Decentralized Exchange (DEX) Leverage Finality for Better Execution?](https://learn.greeks.live/wp-content/uploads/2025/10/Dual-Lens-Digital-Sensor-Array-Representing-Decentralized-Exchange-Liquidity-Provisioning-Mechanisms.webp)

A DEX uses T+0 finality to execute trades atomically and irreversibly, eliminating counterparty and settlement risk for better execution.

### [What Is the Role of a "Supermajority" in PoS Finality?](https://learn.greeks.live/path/what-is-the-role-of-a-supermajority-in-pos-finality/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Is the Role of a "Supermajority" in PoS Finality?](https://learn.greeks.live/wp-content/uploads/2025/10/Precision-Actuation-Dynamics-of-Near-Zero-Latency-Hardware-Wallet-Seed-Phrase-Retrieval-Mechanism.webp)

Two-thirds of staked validators must sign a block for it to be finalized, making it irreversible and subjecting reversers to slashing penalties.

### [What Is a "Long-Range Attack" and Is It Unique to PoS Systems?](https://learn.greeks.live/path/what-is-a-long-range-attack-and-is-it-unique-to-pos-systems/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Is a "Long-Range Attack" and Is It Unique to PoS Systems?](https://learn.greeks.live/wp-content/uploads/2025/10/Simulated-High-Frequency-Crypto-Derivative-Sampling-Apparatus-Aperture-Interface-Visualization.webp)

A long-range attack is creating an alternative chain from history, a major PoS risk due to low cost, unlike PoW's high re-mining cost.

### [What Is the Relationship between Collision Resistance and the Concept of "Finality" in Blockchain Transactions?](https://learn.greeks.live/path/what-is-the-relationship-between-collision-resistance-and-the-concept-of-finality-in-blockchain-transactions/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Is the Relationship between Collision Resistance and the Concept of "Finality" in Blockchain Transactions?](https://learn.greeks.live/wp-content/uploads/2025/10/Tokenized-Asset-Interconnectivity-Mechanism-Illustrating-Decentralized-Exchange-Atomic-Swaps-Mechanisms.webp)

Strong collision resistance is essential for transaction finality, as it prevents the creation of fraudulent blocks that could alter the blockchain.

### [Explain the Concept of "Economic Finality" in a PoS Blockchain](https://learn.greeks.live/path/explain-the-concept-of-economic-finality-in-a-pos-blockchain/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![Explain the Concept of "Economic Finality" in a PoS Blockchain](https://learn.greeks.live/wp-content/uploads/2025/10/Opaque-and-Translucent-Cyclic-Structures-Intersecting-Stylized-Binary-Asset-Handlers.webp)

Economic finality is transaction irreversibility achieved when two-thirds of staked ETH attests to a block, making reversal prohibitively costly.

### [What Is 'Transaction Finality' and Why Is It Important in Blockchain?](https://learn.greeks.live/path/what-is-transaction-finality-and-why-is-it-important-in-blockchain/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Is 'Transaction Finality' and Why Is It Important in Blockchain?](https://learn.greeks.live/wp-content/uploads/2025/10/Precision-Actuator-Assembly-Interface-for-Decentralized-Autonomous-Organization-Governance-Mechanisms.webp)

Guarantee that a transaction cannot be reversed. Ensures trust, certainty, and integrity for financial transfers.

### [How Do "Finality Gadgets" in PoS Systems Serve a Similar Function to Checkpoints?](https://learn.greeks.live/path/how-do-finality-gadgets-in-pos-systems-serve-a-similar-function-to-checkpoints/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![How Do "Finality Gadgets" in PoS Systems Serve a Similar Function to Checkpoints?](https://learn.greeks.live/wp-content/uploads/2025/10/Precision-Actuator-Mechanism-Interfacing-with-Overlapping-High-Density-Data-Substrates-Representing-Tokenized-Asset-Stratification.webp)

Finality gadgets use a supermajority of PoS validators to deterministically finalize blocks, providing a stronger, protocol-enforced irreversibility than PoW checkpoints.

### [How Does the Concept of 'Settlement' in Derivatives Relate to Blockchain Finality?](https://learn.greeks.live/path/how-does-the-concept-of-settlement-in-derivatives-relate-to-blockchain-finality/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![How Does the Concept of 'Settlement' in Derivatives Relate to Blockchain Finality?](https://learn.greeks.live/wp-content/uploads/2025/10/Decentralized-Exchange-Order-Book-Visualization-Reflecting-Volatility-Surface-Dynamics-in-Digital-Asset-Derivatives.webp)

Settlement: definitive conclusion of a Derivatives contract. Finality: definitive, permanent recording of a blockchain transaction. Blockchain enables trustless settlement.

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**Original URL:** https://learn.greeks.live/learn/what-is-transaction-finality-in-pos/
