# Blockchain's Dirty Secret , It’s Not Forever, Immutability != Permanency Source: https://x.com/BramasPaul/status/1908134658761519237 Kiwi News: https://news.kiwistand.com/stories/Blockchains-Dirty-Secret-Its-Not-Forever-Immutability-Permanency?index=0x67efd3ceed18f08cbb2d1511e75dc074cd2467ebbc0e643fd5e0efd12f1d7e2b72fa8291 Submitted by 0xf9f9...736D on 2025-04-04 UTC, 2 upvotes, 1 comment ## Summary Blockchain immutability, meaning recorded data cannot be altered, does not guarantee that the data will remain permanently existent or accessible. The article says permanency depends on protocol evolution, data archiving strategies and economic incentives for node operators. It cites Solana's move to archive its historical data on Filecoin, replacing Google BigTable, which the Solana Foundation had used with gated access, and notes that Filecoin uses rental contracts rather than one-time payments, so data may not be kept if the owner stops paying for storage. ## Article It’s Not Forever, Immutability != Permanency Blockchain technology is known for its immutability. This means once data is recorded, it can't be changed. This creates a sense of security and permanence. However, it's crucial to understand that immutability does not equal permanence. While blockchain data can't be changed, it can be lost. TL;DR: Immutability means data on a blockchain cannot be altered after it's written. It does not guarantee that data will always be accessible or exist. Permanency implies data will exist forever, which isn't guaranteed on a blockchain. Data permanence depends on protocol updates, data management, and economic incentives. Understanding the distinction between immutability and permanency is critical for realistic blockchain adoption. The Illusion of Forever: Understanding Immutability One of the core strengths of blockchain technology lies in its immutability. Once a transaction or piece of data is validated and added to a block, it's cryptographically linked to all preceding blocks. Altering a single block would require altering all subsequent blocks, a computationally expensive (and often practically impossible) task for a chain with a high Nakamoto coefficient. This creates a high degree of confidence in the integrity of the data. However, this immutability only addresses alteration. It does not guarantee the data will always be accessible. Consider this analogy: an inscription etched into a stone tablet is immutable (you can't easily change the carving), but the tablet itself can still be lost, destroyed, or become inaccessible. Why Immutability Doesn't Guarantee Permanence Beyond technical glitches like those experienced by Solana, several other factors can influence the long-term permanency of blockchain data, irrespective of its immutable nature. While often resolved, the potential for prolonged failures cannot be entirely dismissed. The evolution of blockchain protocols can also impact data permanency. If a blockchain protocol becomes outdated, the data might become less relevant or even abandoned from a business perspective but are still much needed for tax purposes, legal purposes, etc, directly impacting the users. Data management and archival strategies employed by blockchain networks play a role. As blockchains grow in size, storing the entire historical ledger on every node can become resource-intensive. Some networks might implement strategies for archiving or pruning older data to maintain efficiency. While this data might still exist in some form, it might not be readily accessible to all network participants, potentially impacting its perceived permanency. Additionally, the long-term viability of a blockchain network is also tied to its economic incentives. If the economic rewards for maintaining the network diminish significantly over time, the number of nodes supporting the blockchain could decrease, potentially impacting its long-term resilience and data accessibility. For example, Solana now archives its historical data on Filecoin, a major step toward data decentralization. Previously, the Solana Foundation relied on Google BigTable to store this data, with access gatekept. This shift marks significant progress in opening up data access. However, nothing guarantees that the data stored are the correct ones and haven't been tampered with intentionally or not; in the best-case scenario, if someone can find a different copy from another data source, those data are verifiable but not verified, they can't be used trustless, in the worst case the data are not even verifiable. You just end up in a trust me bro situation. It's also important to understand that decentralized storage doesn't mean it is permanently stored since Filecoin doesn't support a one-time payment to store data! Instead, it only supports a "rental" contract-based system to store data, meaning if the "owner" of the data decides to stop its services, the data will not be kept. Conclusion While immutability is a fundamental and highly valuable characteristic of blockchains, ensuring the integrity of recorded data by preventing alterations, it does not inherently guarantee the permanent existence and accessibility of that data. Permanency is a separate concept that depends on a multitude of factors, including the stability and resilience of the network infrastructure, the evolution of the underlying protocols, the data management strategies employed. The incidents experienced by the several blockchains serve as a real-world reminder that even with strong guarantees of immutability, blockchain data can still be subject to periods of inaccessibility or potential long-term loss due to various technical and operational challenges. Therefore, it is crucial for users and developers to understand this distinction and to consider the broader ecosystem when evaluating the long-term prospects and accessibility of data stored on a blockchain. If you want to read more about decentralized storage solution you can check my latest article where I break down some of the current solutions ## Comments **tim**: Yeah sure, try to convince a Bitcoiner