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As of my last knowledge update in October 2021, D (D) cryptocurrency refers to various projects, but a specific "D (D)" cryptocurrency may not be widely recognized or established. However, if you are referring to a more recent or specific project, could you please provide more context or specify the full name or symbol of the cryptocurrency?

Generally, cryptocurrencies can have various use cases, including but not limited to:

1. Medium of Exchange: Many cryptocurrencies are designed to facilitate peer-to-peer transactions, allowing users to send and receive payments without intermediaries.

2. Store of Value: Some cryptocurrencies are viewed as a store of value, akin to digital gold. This function is primarily associated with Bitcoin.

3. Decentralized Finance (DeFi): Many newer cryptocurrencies and tokens facilitate decentralized financial services such as lending, borrowing, and yield farming.

4. Smart Contracts: Platforms like Ethereum support smart contracts, enabling the development of decentralized applications (dApps) that fulfill various functions across industries.

5. Non-Fungible Tokens (NFTs): Certain cryptocurrencies are used to create and trade NFTs, which represent ownership of unique digital assets.

6. Governance: Some tokens provide voting rights within a particular ecosystem, allowing holders to influence the future direction of the project.

7. Incentives: Cryptocurrencies can be used as incentives within networks, rewarding users for participation, staking, or contributing to the ecosystem.

If you have a specific project in mind, please specify, and I can provide more tailored information based on the known use cases and functionalities since then.

"D" could refer to various projects or platforms in the blockchain space. However, without more specific context, it's challenging to provide an accurate answer.

If you are referring to a specific cryptocurrency or project, please provide more details (like the full name or a description), and I can give you information about which blockchain it uses or whether it operates on its own or atop another blockchain.

Yes, D is a programmable language that supports various programming paradigms, including systems programming and application development. However, D itself is not directly designed for blockchain applications or decentralized applications (dApps) in the same way that languages like Solidity are for Ethereum smart contracts.

That said, developers can use D to build server-side applications or back-end services that interact with blockchain networks and smart contracts. For instance, you could write a D application that communicates with a blockchain through APIs or libraries, enabling functionality related to decentralized applications.

If you're looking for a language specifically for developing smart contracts or decentralized applications, you might want to consider languages that are explicitly designed for that purpose, such as Solidity (for Ethereum), Vyper, or Rust (for specific blockchain platforms like Solana or Polkadot).

The speed and throughput of D transactions can vary significantly depending on the specific blockchain platform you're referring to. However, in general terms:

1. Confirmation Time: This is the time it takes for a transaction to be included in a block and considered confirmed. For many popular blockchains:

   • Bitcoin: Typically around 10 minutes for one confirmation (though transactions can start being included in blocks fairly quickly).
   • Ethereum: Usually around 10-15 seconds for a transaction to be confirmed.
   • Ripple (XRP): Approximately 4 seconds.
   • Solana: Can achieve transaction finality in around 400 milliseconds.

2. Throughput (Transactions Per Second): This indicates how many transactions a blockchain can handle per second:

   • Bitcoin: Roughly 7 transactions per second (TPS).
   • Ethereum: Approximately 30 TPS on the current system, but can increase with layer 2 scaling solutions and Ethereum 2.0.
   • Ripple (XRP): Can handle around 1,500 TPS.
   • Solana: Can process over 65,000 TPS under optimal conditions.

For newer blockchains or specialized platforms (like those focusing on speed and scalability, such as Algorand, Cardano, or Avalanche), these numbers can be much higher, often exceeding thousands of TPS.

Keep in mind that these values can fluctuate based on network congestion, the specific algorithms used, block size, and other technical parameters. Additionally, protocols may continuously evolve, potentially improving speed and throughput over time.

The D blockchain, like many other blockchain platforms, typically allows for data storage on-chain, but the amount of data you can store may vary based on several factors:

1. Block Size and Storage Model: Each blockchain has a maximum block size and other parameters that limit how much data can be included in a single transaction or block. For instance, Bitcoin has a limit of 1 MB per block, while Ethereum has a gas limit that directly influences the size of transactions.

2. Consensus Mechanism: Different blockchains use different consensus mechanisms which can also affect how data is handled. For example, block time and transaction throughput can vary across platforms.

3. Cost: Storing data on the blockchain is usually not free. Most blockchain platforms require a transaction fee, which can become expensive depending on the network's current congestion.

4. Purpose of the Blockchain: Some blockchains are specifically designed for smart contract execution and may not be optimized for large amounts of raw data. Others are built with data storage in mind.

5. Data Structure: The structure of the data you wish to store (e.g., simple key-value pairs vs. complex data) can also affect how much can be stored effectively.

In general, while you can store data on the D blockchain, the practical limits will depend on the platform’s specific features and current state. It's advisable to refer to the official documentation of the D blockchain or any community resources for precise details regarding storage capabilities, best practices, and costs associated with storage.