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An NFT subscription model gives a customer a blockchain record that represents access to digital content for a defined period. The practical version is not simply “mint an NFT and hide a page.” You need four connected parts: a membership contract, a checkout, an authorization check, and a content-delivery system.
Unlock Protocol packages much of this model into a Lock and its associated Key. A Lock is the smart contract that manages membership NFTs; a Key is the NFT issued to a member. Keys can expire, be renewed, transferred, lent, or purchased for another wallet, depending on the Lock configuration.
What an NFT subscription actually represents
In an NFT-based subscription, the token is normally a proof of membership rather than the content itself. For example, a customer might receive a Key that grants access to a paid newsletter for 30 days, a video library for one year, or a digital download while the Key remains valid.
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The token does not automatically make a file private. If a video or PDF is available at a publicly discoverable URL, visitors may still retrieve it unless your server or delivery layer checks authorization before returning it. Likewise, an NFT standard does not define recurring billing or subscription renewal by itself.
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| Component | Responsibility |
|---|---|
| Lock | Smart contract that creates and manages membership Keys. |
| Key | The member’s NFT and membership record, including its expiration. |
| Checkout | Lets a visitor pay and receive a Key, potentially with card or cryptocurrency. |
| Authorization | Checks whether the wallet currently has valid access. |
| Content server | Returns premium pages, files, API responses, or media only after authorization. |
Choose the token model
ERC-721: one identifiable membership
ERC-721 is a natural fit when each membership is individually identifiable. It provides ownership, transfer, balance, and approval functions, but it does not provide expiration, recurring charges, renewal, or content permissions. Those features must be added by your contract or supplied by a membership protocol.
Unlock Locks are ERC-721-compatible contracts. A Key is valid only for the Lock that created it. By default, one address can own one Key for a Lock, although that limit can be changed with setMaxKeysPerAddress.
ERC-1155: several interchangeable tiers
ERC-1155 is useful when your application has a small number of membership tiers, such as:
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- Token ID 2: Professional access
- Token ID 3: Enterprise access
ERC-1155 can represent fungible, non-fungible, or semi-fungible token types. It is not inherently an NFT standard in the sense of every token being unique. A token ID with a supply of one is effectively non-fungible; a token ID with a large supply represents interchangeable units.
The standard supports batch operations such as balanceOfBatch and safeBatchTransferFrom. It still does not provide subscription expiration or renewal. You would need to implement those rules yourself or use a membership service designed for them.
| Use case | Practical choice |
|---|---|
| Individually tracked, expiring membership | ERC-721-compatible Lock such as Unlock. |
| Several interchangeable access tiers | ERC-1155, with expiration logic added separately. |
| Resale of a membership | ERC-721 or ERC-1155 with transfer rules that match your business policy. |
| Subscription with renewal and checkout already designed | A membership protocol such as Unlock rather than a bare token contract. |
Build the subscription with Unlock
Unlock calls the membership NFT a Key and the issuing contract a Lock. A Lock can use a fixed expiration duration for recurring access or an effectively infinite duration. When a Key expires, the customer must renew to continue accessing the service.
The Lock can accept native blockchain currency or an ERC-20 currency. In the contract initialization data, the zero address represents native currency. The Lock also defines the price, duration, maximum number of Keys, and name.
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For a JavaScript deployment project, install the documented package:
yarn add @unlock-protocol/contracts2. Pin the PublicLock version
For a repeatable deployment, use createUpgradeableLockAtVersion rather than relying on the protocol’s current default. The version-pinned method receives initialization calldata and an explicit PublicLock version. This prevents a later protocol release from silently changing the version used by your deployment script.
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The documented example imports version-specific ABIs and makes the version number match the PublicLock ABI:
const Unlock = require('@unlock-protocol/contracts').UnlockV12.abi
const PublicLock = require('@unlock-protocol/contracts').PublicLockV13.abi
const version = 13The initialization signature is:
initialize(address,uint256,address,uint256,uint256,string)Its arguments are, in order:
- The first Lock Manager address.
- Expiration duration in seconds.
- The ERC-20 currency address, or the zero address for native currency.
- The price in the currency’s base units.
- The maximum number of Keys.
- The Lock name.
After encoding those arguments, the documented deployment call is:
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3. Configure membership rules
Decide these rules before publishing the checkout:
- How long a purchased Key lasts—for example, 30 days or 365 days.
- Whether the Lock has a finite supply.
- Whether members can transfer Keys.
- Whether one wallet may hold more than one Key.
- Whether customers may buy a Key for another address.
- Whether lending is permitted.
- Which wallet or wallets have the Lock Manager role.
Ownership is transferable unless the Lock’s transfer behavior is configured otherwise. Transferability can be useful for a tradable membership, but it can conflict with a personal subscription or an account-based service. Test the behavior you intend to sell.
Locks deployed at version 10 or later are upgradeable by their Lock Manager through the Unlock contract, using only protocol-supported versions approved by the Unlock DAO. If the Lock Manager role is renounced and no manager remains, the Lock cannot be upgraded. Treat the manager key as an operational security credential.
PublicLock version 15, released in January 2025, added features including referrer and protocol-referrer handling, referrer reuse during renewals, multiple periods in one purchase, a hasRole hook, and the ability to burn or permanently disable a Lock. Burning a Lock cannot currently be reversed and makes its existing data inaccessible, even though blockchain storage is not deleted.
Create a checkout
The current product for creating a customized membership-purchase experience is the Checkout Builder in the Unlock Dashboard, linked at app.unlock-protocol.com. The builder can customize checkout appearance, upload a logo, define labels, collect additional information, and produce either a checkout link or JSON configuration for the Paywall.
The dashboard also supports member management, editing Key properties, refunds, bulk Key airdrops from CSV, member-list CSV export, Lock Manager assignment, and Stripe account connection. Stripe integration is managed from the Unlock Dashboard. A connected account can manage Locks deployed elsewhere when it has the Lock Manager role.
Do not assume that a checkout purchase alone creates an account in your application. Your application still needs to associate the wallet’s membership with a user session, profile, or customer record if your service has non-blockchain features.
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Add a front-end paywall
For a JavaScript application, install the current Paywall package:
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npm install @unlock-protocol/paywallImport it and provide network configuration using numeric chain IDs and provider URLs:
import { Paywall } from '@unlock-protocol/paywall'
const networkConfigs = {
1: {
provider: 'HTTP PROVIDER',
},
100: {
// configuration for Gnosis Chain
},
}
const paywall = new Paywall(networkConfigs)
const response = await paywall.loadCheckoutModal(paywallConfig)The response may include the transaction hash and Lock address. The exact paywallConfig should come from the Checkout Builder or your Lock configuration rather than being copied blindly between networks.
You can also load the browser version from the CDN:
<script src="https://paywall.unlock-protocol.com/static/unlock.latest.min.js"></script>The browser configuration must be global and named unlockProtocolConfig:
<script>
var unlockProtocolConfig = {
// paywallConfig object
}
</script>Open the checkout with:
window.unlockProtocol &&
window.unlockProtocol.loadCheckoutModal()For authorization changes, listen for unlockProtocol.status. Its detail contains either unlocked or locked:
document.addEventListener('unlockProtocol.status', (event) => {
const isUnlocked = event.detail.state === 'unlocked'
document.body.classList.toggle('member-content-visible', isUnlocked)
})The callback can fire repeatedly. For example, it may fire after a visitor purchases access during the visit or after an existing Key expires. Do not treat the first result as permanent. The unlockProtocol.closeModal event only means that the modal closed; it does not prove that the visitor is authorized.
Protect content on the server
Front-end gating is appropriate for changing the interface—for example, showing a locked preview and opening a purchase modal. It is not secure protection for a premium download, API, or server-rendered page. A visitor can modify JavaScript in the browser console and reveal UI elements.
For an Express application, install the documented integration:
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npm i @unlock-protocol/unlock-expressor:
yarn add @unlock-protocol/unlock-expressConfigure it by importing:
const configureUnlock = require('@unlock-protocol/unlock-express')The first argument is your Paywall configuration, the second is the application’s Passport instance, and the optional third argument can define custom RPC providers and a baseUrl. Custom providers use this shape:
providers: {
1: 'https://your-rpc-endpoint.example'
}Place authorization in the request path that serves the protected resource. Do not return the private file first and check membership afterward. A typical design is:
- The visitor connects a wallet and signs the application’s authentication message.
- Your application creates a session tied to the verified wallet address.
- The protected route checks the wallet’s current Key validity for the relevant Lock.
- The server returns the content only when the check succeeds.
- The check is repeated as needed instead of trusting a long-lived cached result.
When implementing your own contract check, remember that Unlock’s balanceOf is membership-aware. It returns zero when the address has no valid membership or when the Key has expired, and a positive value otherwise. Use keyExpirationTimestampFor when you need the expiration timestamp. Do not substitute a generic ERC-721 balance assumption without accounting for expiration.
Handle renewals, transfers, and changing state
A subscription system must define what happens when access changes after the page loads:
- Expiration: a member may begin with access and lose it during the visit.
- Renewal: a member may purchase another period and regain access without creating a new application account.
- Transfer: the Key may move to another address unless transfers are disabled.
- Lending: the person using the content may not be the permanent owner.
- Purchase for another address: the payer and member can be different wallets.
- Refund: your application must decide how a refunded or disabled membership affects access.
RPC responses and membership state can change. Avoid treating a cached balanceOf or validity result as permanently authoritative. For high-value content, recheck at the point of delivery and use short-lived application sessions.
Design payment and pricing carefully
A Lock can use native currency or an ERC-20 token. A custom checkout may need to retrieve the currency, price, duration, maximum supply, and sold-out state so that the interface displays and validates the same values as the contract.
Credit-card payments can be offered through Unlock checkout, and the checkout can collect additional information and redirect the purchaser back to your application after payment. Card payments make onboarding easier, but they do not remove the need to identify the wallet that will hold the Key.
Keep blockchain fees visible in your product design. A customer paying for a low-cost subscription may be surprised by network gas, wallet prompts, or a slow confirmation. If you use another marketplace or exchange mechanism, remember that thirdweb Marketplace V3 is for direct listings, English auctions, and offers—not subscription expiration. Its actions require gas unless a separate meta-transaction system is implemented.
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A practical implementation sequence
- Define the entitlement: write down exactly what a valid Key unlocks and whether access ends at expiration.
- Choose the token model: use a Lock/ERC-721-compatible membership for individually tracked subscriptions, or build expiration logic around ERC-1155 tiers.
- Deploy a test Lock: set a short duration, low price, and small supply on the target test environment.
- Pin the contract version: use
createUpgradeableLockAtVersionand record the PublicLock version and deployment transaction. - Build checkout: configure the Checkout Builder, test wallet payments and card payments if enabled, and verify redirect behavior.
- Implement wallet authentication: prove control of the wallet with a signed message before creating an application session.
- Gate the interface: use Paywall status events for purchase prompts and member UI.
- Gate the resource: enforce authorization in Express or another server/API layer for files, media, and premium responses.
- Test state changes: test expiration, renewal, transfer, wrong-network wallets, rejected transactions, sold-out Locks, refunds, and a visitor who never connects a wallet.
- Monitor operations: protect the Lock Manager credentials, document the Lock address and chain ID, and decide how upgrades or permanent Lock disabling are governed.
Common mistakes
| Mistake | Why it fails | Better approach |
|---|---|---|
| Calling any ERC-721 a subscription | ERC-721 does not define duration or renewal. | Use a membership protocol or implement expiration and renewal explicitly. |
| Calling every ERC-1155 asset an NFT | ERC-1155 also represents fungible and semi-fungible supplies. | Choose token IDs and supply rules that match the membership model. |
| Hiding premium content with JavaScript | Browser code can be modified and URLs can be reused. | Authorize downloads, APIs, and rendered content server-side. |
| Using generic NFT balance logic | An expired Unlock Key should not grant access. | Use Unlock’s validity-aware checks and expiration data. |
Assuming createLock is stable |
It follows the current protocol version. | Pin the PublicLock version for scripted deployments. |
| Ignoring transfers | Access can move to another wallet if transfers are allowed. | Configure transfer policy and recheck the current owner. |
Use NFTs as authorization, not as a privacy mechanism
The strongest NFT subscription designs separate ownership from delivery. The blockchain records membership and its current validity; your application decides what that membership permits; the server enforces the decision before returning valuable content.
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For a straightforward recurring membership, an Unlock Lock and expiring Key avoid rebuilding the most difficult subscription primitives. Use the Unlock Dashboard and Checkout Builder for purchase operations, Paywall for the user interface, and server-side authorization for anything that must genuinely remain restricted.
FAQ
Does minting an ERC-721 NFT create a subscription?
No. ERC-721 supplies ownership, transfer, balance, and approval functions. Expiration, recurring billing, renewal, and content authorization require additional contract logic or a membership protocol such as Unlock.
What is the difference between an Unlock Lock and a Key?
The Lock is the smart contract that creates and manages memberships. The Key is the ERC-721-compatible membership NFT issued by that Lock. A Key is valid only for the Lock that created it and can have an expiration date.
Can I use an ERC-1155 token for membership tiers?
Yes. Each tier can be represented by a token ID, which is useful for interchangeable memberships. However, ERC-1155 does not include subscription expiration or renewal, so those rules must be implemented separately.
Is a front-end NFT ownership check secure?
No. Front-end-only gating can be bypassed by changing JavaScript in browser developer tools. Use front-end checks for interface behavior and server-side authorization for downloads, APIs, media, and protected pages.
How does an Unlock subscription expire?
The Lock can assign an expiration duration to a Key. After expiration, the member must renew to continue access. Unlock’s validity-aware balanceOf returns zero for an expired membership; keyExpirationTimestampFor provides the expiration timestamp.
Can a customer pay for a Key for somebody else?
Yes. Unlock supports purchasing a Key for another address. Your application should distinguish the payer from the wallet that receives and uses the membership.
Should I use createLock or createUpgradeableLockAtVersion?
createLock deploys with the current protocol version and may change behavior after a future release. Use createUpgradeableLockAtVersion when you need a deployment script to specify the PublicLock version explicitly.
Can members transfer or lend subscription Keys?
Ownership is transferable unless the Lock’s transfer behavior prevents it. Unlock also supports lending and changing Key attributes through Lock-management functions. Decide whether those behaviors fit a personal or tradable subscription before launch.
The Bottom Line
An NFT subscription is a membership system built around a token, not a token alone. Use an expiring Unlock Key when you want a ready-made ERC-721-compatible membership model, or use ERC-1155 for tiered interchangeable balances with your own expiration logic. Then connect checkout, wallet authentication, current validity checks, and server-side content delivery. That combination—not a visible NFT in a wallet—is what turns blockchain ownership into a usable subscription.
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