
Introducing the 4K Physical Guardian Protocol
The ability to connect the physical and on-chain worlds has long been one of the holy grails of blockchain. Though to date, attempts to bridge these worlds have been centralized, ad-hoc, and rife with misaligned incentives. At 4K, we’re building a decentralized protocol for connecting the on-chain and physical worlds. While a centralized approach would be easier, we believe that only a decentralized approach is capable of making physical assets a new, trusted web3 primitive. A decentralized a...

The 4 Different Types of NFTs for Bringing Real World Assets On-Chain
Bringing real world, physical objects on-chain has long been a “holy grail” for the world of crypto. NFTs and the underlying blockchain technology offer new forms of value creation, making a Web3 transition the next logical step for industries dealing in physical goods. There are a number of Web3 projects aiming to tether the physical world to the digital one. We’ve identified the strengths and weaknesses across different classes of “phygital” solutions to demonstrate where they succeed and w...

Why We’re Moving Our Blog to Mirror.xyz
TL;DR:Crypto-native: Posts are stored on-chain using a Web3 native protocol.Cryptographically Secure: Posts are owned by 4K and not by a centralized intermediary.Supports fellow builders: Embeds our work within the larger crypto ecosystem and supports those building the future of Web3.Greetings, crypto community! As Web3 continues to evolve, new tools are rapidly being created to provide decentralized versions of common Internet services like content management, blog hosting, and storage prov...
Unlocking value for physical assets in Web3. Physical NFT Minting & Logistics for Marketplaces, Brands, dApps & DeFi.



Introducing the 4K Physical Guardian Protocol
The ability to connect the physical and on-chain worlds has long been one of the holy grails of blockchain. Though to date, attempts to bridge these worlds have been centralized, ad-hoc, and rife with misaligned incentives. At 4K, we’re building a decentralized protocol for connecting the on-chain and physical worlds. While a centralized approach would be easier, we believe that only a decentralized approach is capable of making physical assets a new, trusted web3 primitive. A decentralized a...

The 4 Different Types of NFTs for Bringing Real World Assets On-Chain
Bringing real world, physical objects on-chain has long been a “holy grail” for the world of crypto. NFTs and the underlying blockchain technology offer new forms of value creation, making a Web3 transition the next logical step for industries dealing in physical goods. There are a number of Web3 projects aiming to tether the physical world to the digital one. We’ve identified the strengths and weaknesses across different classes of “phygital” solutions to demonstrate where they succeed and w...

Why We’re Moving Our Blog to Mirror.xyz
TL;DR:Crypto-native: Posts are stored on-chain using a Web3 native protocol.Cryptographically Secure: Posts are owned by 4K and not by a centralized intermediary.Supports fellow builders: Embeds our work within the larger crypto ecosystem and supports those building the future of Web3.Greetings, crypto community! As Web3 continues to evolve, new tools are rapidly being created to provide decentralized versions of common Internet services like content management, blog hosting, and storage prov...
Unlocking value for physical assets in Web3. Physical NFT Minting & Logistics for Marketplaces, Brands, dApps & DeFi.

Subscribe to 4K Protocol: The Physical-Digital Bridge

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The 4K Marketplace is the central hub for conducting transactions between buyers and sellers of items on our platform. Physical items listed on the 4K Marketplace are first converted into NFTs, or Non-Fungible-Tokens. These NFTs represent the tangible, physical items that we help you to "digitally-bridge" using the 4K Protocol. In practice, this means that once you are ready to sell an item, you'll have a quick call with a representative at 4K, ship your item to a secure vault owned by 4K, and gain ownership of an NFT representing the physical item which can then be listed on the 4K Marketplace.
Once you list your "digitally-bridged" item on the 4K Marketplace, the item will be available for purchase from buyers immediately using cryptocurrency.
Before listing any "digitally-bridged" items on the 4K Marketplace, you'll need to make sure you have successfully connected a crypto wallet to 4K.
For now, the only supported self-custodial wallet is MetaMask.
For full instructions on connecting your wallet, follow the steps outlined in this article.
If you are new to the 4K Marketplace, you will need to register as a seller and work with a 4K representative to list your items. If you already own a physically-backed NFT that was purchased on the 4K Marketplace, you can skip to Step 2 to list your physically-backed NFT directly on the 4K Marketplace.
To begin, click the "become a seller" button in the homepage header.

Our partnership page contains information around the types of items that we tend to list on our marketplace. If you have an item that qualifies, or if you think that your item would make a good addition to our inventory, reach out to us by clicking the "Contact Us" button near the middle of the page.

Fill out the intake form with your information, and one of our Business Development representatives will reach out to you within a few days. They will walk you through the process of transferring over your inventory and converting your items to physically-backed NFTs.

Once your physical items have been "digitally-bridged" to NFTs, they are ready to be listed on the 4K Marketplace.
Upon entering the marketplace, you will be prompted by your crypto wallet for a signature request. Ensure your wallet is connected, and approve the request.

The Marketplace page lists out all items currently in 4K's inventory.

You can view the portfolio of items you own by clicking the dropdown menu in the top right corner of the page. Under the dropdown options, click "Profile."

The Dashboard Profile acts as a portfolio for all of your currently owned items. From this page, you are able to sell the item directly on the 4K Marketplace, or redeem the digital NFT for the physical item.

We recommend updating your profile to include your username and email as soon as possible to stay notified on the status of your items.

When you are ready to list your items, click the "Sell" button on the item in your portfolio. The following module will appear in which you are able to set a price target and expiration date for your item.

Upon clicking "Sell," the 4K Marketplace will once again ask to access your wallet. Confirming this request will complete your listing. Keep in mind that there may be gas fees associated with your listing.

Once the listing is completed, the following confirmation screen will appear.

Once your item is listed on the Marketplace, it is available to purchase for Buyers. If you wish to cancel your listing, click on the item page and click "Cancel Sale."

Buyers are able to make offers that are lower than the price you initially set. Offers can be seen on this tab in the item listing. If you wish to accept an offer, you can do so on this screen.

To learn how to buy an item on 4K, check out this article.
Follow us on Twitter and Discord for the latest 4K news.
And be sure to check out our latest marketplace listings here!
The 4K Marketplace is the central hub for conducting transactions between buyers and sellers of items on our platform. Physical items listed on the 4K Marketplace are first converted into NFTs, or Non-Fungible-Tokens. These NFTs represent the tangible, physical items that we help you to "digitally-bridge" using the 4K Protocol. In practice, this means that once you are ready to sell an item, you'll have a quick call with a representative at 4K, ship your item to a secure vault owned by 4K, and gain ownership of an NFT representing the physical item which can then be listed on the 4K Marketplace.
Once you list your "digitally-bridged" item on the 4K Marketplace, the item will be available for purchase from buyers immediately using cryptocurrency.
Before listing any "digitally-bridged" items on the 4K Marketplace, you'll need to make sure you have successfully connected a crypto wallet to 4K.
For now, the only supported self-custodial wallet is MetaMask.
For full instructions on connecting your wallet, follow the steps outlined in this article.
If you are new to the 4K Marketplace, you will need to register as a seller and work with a 4K representative to list your items. If you already own a physically-backed NFT that was purchased on the 4K Marketplace, you can skip to Step 2 to list your physically-backed NFT directly on the 4K Marketplace.
To begin, click the "become a seller" button in the homepage header.

Our partnership page contains information around the types of items that we tend to list on our marketplace. If you have an item that qualifies, or if you think that your item would make a good addition to our inventory, reach out to us by clicking the "Contact Us" button near the middle of the page.

Fill out the intake form with your information, and one of our Business Development representatives will reach out to you within a few days. They will walk you through the process of transferring over your inventory and converting your items to physically-backed NFTs.

Once your physical items have been "digitally-bridged" to NFTs, they are ready to be listed on the 4K Marketplace.
Upon entering the marketplace, you will be prompted by your crypto wallet for a signature request. Ensure your wallet is connected, and approve the request.

The Marketplace page lists out all items currently in 4K's inventory.

You can view the portfolio of items you own by clicking the dropdown menu in the top right corner of the page. Under the dropdown options, click "Profile."

The Dashboard Profile acts as a portfolio for all of your currently owned items. From this page, you are able to sell the item directly on the 4K Marketplace, or redeem the digital NFT for the physical item.

We recommend updating your profile to include your username and email as soon as possible to stay notified on the status of your items.

When you are ready to list your items, click the "Sell" button on the item in your portfolio. The following module will appear in which you are able to set a price target and expiration date for your item.

Upon clicking "Sell," the 4K Marketplace will once again ask to access your wallet. Confirming this request will complete your listing. Keep in mind that there may be gas fees associated with your listing.

Once the listing is completed, the following confirmation screen will appear.

Once your item is listed on the Marketplace, it is available to purchase for Buyers. If you wish to cancel your listing, click on the item page and click "Cancel Sale."

Buyers are able to make offers that are lower than the price you initially set. Offers can be seen on this tab in the item listing. If you wish to accept an offer, you can do so on this screen.

To learn how to buy an item on 4K, check out this article.
Follow us on Twitter and Discord for the latest 4K news.
And be sure to check out our latest marketplace listings here!
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