fix url

Author: 0xlukem

infrastructure/running-a-validator/requirements.md

@@ -64,7 +64,7 @@ Be aware that some providers may overprovision the underlying host and use share
 - **[Vultr](https://www.vultr.com/){target=\_blank}**: Offers flexibility with plans that may meet validator requirements, especially for high-bandwidth needs.
 - **[Linode](https://www.linode.com/){target=\_blank}**: Provides detailed documentation, which can be helpful for setup.
 - **[Scaleway](https://www.scaleway.com/en/){target=\_blank}**: Offers high-performance cloud instances that can be suitable for validator nodes.
-- **[OnFinality](https://onfinality.io/){target=\_blank}**: Specialized in blockchain infrastructure, OnFinality provides validator-specific support and configurations.
+- **[OnFinality](https://onfinality.io/en){target=\_blank}**: Specialized in blockchain infrastructure, OnFinality provides validator-specific support and configurations.
 
 !!! warning "Acceptable use policies"
     Different VPS providers have varying acceptable use policies, and not all allow cryptocurrency-related activities. 

polkadot-protocol/parachain-basics/networks.md

@@ -47,7 +47,7 @@ Development and testing are crucial to building robust dApps and parachains and
 
 Kusama is the experimental version of Polkadot, designed for developers who want to move quickly and test their applications in a real-world environment with economic incentives. Kusama serves as a production-grade testing ground where developers can deploy features and upgrades with the pressure of game theory and economics in mind. It mirrors Polkadot but operates as a more flexible space for innovation.
 
-The native token for Kusama is KSM. For more information about KSM, visit the [Native Assets](https://guide.kusama.network/docs/learn-DOT#kusama-tokens){target=\_blank} page.
+The native token for Kusama is KSM. For more information about KSM, visit the [Native Assets](https://wiki.polkadot.com/kusama/kusama-getting-started/){target=\_blank} page.
 
 ## Test Networks
 

polkadot-protocol/smart-contract-basics/overview.md

@@ -43,7 +43,7 @@ flowchart LR
 
 In addition, because smart contracts are programs that execute on top of existing chains, teams don't have to think about the underlying consensus they are built on.
 
-These strengths do come with certain limitations. Some smart contracts environments, like EVM, tend to be immutable by default. Developers have developed different [proxy strategies](https://blog.openzeppelin.com/proxy-patterns){target=\_blank} to be able to upgrade smart contracts over time. The typical pattern relies on a proxy contract which holds the program storage forwarding a call to an implementation contract where the execution logic resides. Smart contract upgrades require changing the implementation contract while retaining the same storage structure, necessitating careful planning.
+These strengths do come with certain limitations. Some smart contracts environments, like EVM, tend to be immutable by default. Developers have developed different [proxy strategies](https://www.openzeppelin.com/news/proxy-patterns){target=\_blank} to be able to upgrade smart contracts over time. The typical pattern relies on a proxy contract which holds the program storage forwarding a call to an implementation contract where the execution logic resides. Smart contract upgrades require changing the implementation contract while retaining the same storage structure, necessitating careful planning.
 
 Another downside is that smart contracts often follow a gas metering model, where program execution is associated with a given unit and a marketplace is set up to pay for such an execution unit. This fee system is often very rigid, and some complex flows, like account abstraction, have been developed to circumvent this problem.