Filecoinと分散型ストレージ

Welcome! In this lesson, we'll dive into Filecoin, a powerful decentralized storage network. It builds upon the concepts of IPFS to offer persistent and verifiable data storage.

Think of Filecoin as the incentive layer for IPFS. While IPFS tells you where content is, Filecoin makes sure that content is actually stored reliably over time.

In the previous lesson, we learned that IPFS uses content addressing to locate files. However, IPFS itself doesn't guarantee that a file will remain available indefinitely.

• If no one is 'pinning' a file, it might eventually disappear from the network.
• This is where Filecoin steps in. It creates a robust marketplace to ensure data persistence.

Filecoin is a decentralized storage network where anyone can buy or sell storage space. It's a global, open marketplace.

• Users (Clients) pay to store their data.
• Storage Providers (Miners) earn rewards by storing data and proving its availability.

This market competition helps drive down storage costs and offers robust service.

Storage Providers, often called 'miners' in the Filecoin network, are individuals or organizations that dedicate their computer storage to the network.

• They compete to offer storage services to clients.
• These providers must prove they are storing data correctly and reliably over time.

Their participation is crucial for the network's decentralization and reliability.

How does Filecoin verify that storage providers are actually storing the data they claim to? It uses a unique consensus mechanism called Proof-of-Spacetime.

• Miners must regularly submit cryptographic proofs to the blockchain.
• These proofs confirm that they continue to store a client's data correctly and continuously over a specific period.
• This mechanism ensures data integrity and availability.

The native cryptocurrency of the Filecoin network is called FIL. It plays several key roles in the ecosystem:

• Storage Payments: Clients pay FIL to storage providers for storing their data.
• Retrieval Payments: Clients can pay FIL to retrieve their data, especially for faster access.
• Miner Collateral: Storage providers must stake FIL as collateral, incentivizing honest behavior.

FIL is essential for the network's economic model and security.

Storing data on Filecoin involves a few steps:

1. Client Request: A client broadcasts a request to store data, specifying parameters like duration and replication.
2. Deal Making: Storage providers bid to store the data. The client selects a deal.
3. Data Transfer & Proofs: The client encrypts and sends the data to the chosen provider. The provider then begins submitting Proof-of-Spacetime to verify storage.

Once your data is stored on Filecoin, retrieving it is also a straightforward process:

• You can request your data from the original storage provider.
• Alternatively, you can request it from any 'retrieval miner' on the network.
• Retrieval miners specialize in serving data quickly and may be paid a small fee in FIL.

This ensures your data remains accessible and resilient, even if the original provider goes offline.

Filecoin offers compelling advantages over traditional cloud storage:

• Decentralized: No single point of failure or control.
• Verifiable: Cryptographic proofs ensure your data is actually stored.
• Censorship-Resistant: Data is not easily controlled or removed by any central authority.
• Cost-Effective: A competitive marketplace can lead to lower storage prices.

It brings the ethos of Web3 to data storage.

Filecoin is ideal for various applications requiring secure, decentralized, and persistent storage:

• Archiving: Storing historical data, scientific research, or cultural heritage.
• NFT Storage: Ensuring the underlying assets of Non-Fungible Tokens are permanently available.
• Web3 Backends: Providing decentralized storage for DApp user data, media, or large datasets.
• Enterprise Data: Securely storing critical business information with verifiable proofs.

Which of the following is the primary mechanism Filecoin uses to ensure that storage providers are continuously storing data?

Great job! You've now explored Filecoin, a crucial component of the decentralized web.

• Filecoin is a decentralized storage network that provides an incentive layer for IPFS.
• It enables a marketplace where clients pay for storage, and providers earn by storing data.
• Proof-of-Spacetime ensures data integrity and availability over time.
• The FIL token powers transactions and incentivizes participation.

Filecoin is essential for building robust, censorship-resistant DApps and ensuring the long-term availability of data in Web3.