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3. Advanced Course

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  1. 1. What is Taproot?
  2. 2. Blockchain bridges – what are they?
  3. 3. What is Ethereum Plasma?
  4. 4. What is Ethereum Casper?
  5. 5. What is Zk-SNARK and Zk-STARK? 
  6. 6. What is Selfish Mining? 
  7. 7. What is spoofing in the cryptocurrency market? 
  8. 8. Schnorr signatures - what are they? 
  9. 9. MimbleWimble - what is it? 
  10. 10. What is digital property rights in NFT?
  11. 11. What are ETFs and what role do they play in the cryptocurrency market? 
  12. 12. How to verify a cryptocurrency project – cryptocurrency tokenomics 
  13. 13. What is the 51% attack on blockchain?
  14. 14. What is DAO, and how does it work?
  15. 15. Zero-knowledge proof – a protocol that respects privacy 
  16. 16. What is EOSREX?
  17. 17. What is Proof of Elapsed Time (PoET)?
  18. 18. Mirror Protocol – what it is? 
  19. 19. What are synthetic assets? 
  20. 20. How to create your own NFT? 
  21. 21. Definition of DeFi, and what are its liquidations?
  22. 22. New identity system - Polygon ID
  23. 23. Ethereum Foundation and the Scroll protocol - what is it?
  24. 24. What is Byzantine fault tolerance in blockchain technology?
  25. 25. Scalability of blockchain technology - what is it?
  26. 26. Interchain Security - new Cosmos (ATOM) protocol
  27. 27. Coin Mixing vs. Coin Join - definition, opportunities, and threats
  28. 28. What is Ethereum Virtual Machine (EVM) and how does it work?
  29. 29. Soulbound Tokens - what are they, and how do they work?
  30. 30. Definition of LIDO - what is it?
  31. 31. What are Threshold Signatures, and how do they work?
  32. 32. Blockchain technology and cyberattacks.
  33. 33. Bitcoin script - what it is, and what you should know about it.
  34. 34. What is zkEVM, and what are its basic features?
  35. 35. Do confidential transactions on blockchain exist? What is a Confidential Transaction?
  36. 36. Algorithmic stablecoins - everything you should know about them.
  37. 37. Polygon Zk Rollups ZKP - what should you know about it?
  38. 38. What is Web3 Infura?
  39. 39. Mantle - Ethereum L2 scalability - how does it work?
  40. 40. What is the NEAR Rainbow Bridge?
  41. 41. Liquid Staking Ethereum and LSD tokens. What do you need to know about it?
  42. 42. Top 10 blockchain oracles. How do they work? How do they differ?
  43. 43. What are Web3.js and Ether.js? What are the main differences between them?
  44. 44. What is StarkWare, and recursive validity proofs
  45. 45. Quant Network: scalability of the future
  46. 46. Polygon zkEVM - everything you need to know
  47. 47. What is Optimism (OP), and how do its roll-ups work?
  48. 48. What are RPC nodes, and how do they work?
  49. 49. SEI Network: everything you need to know about the Tier 1 solution for DeFi
  50. 50. Types of Proof-of-Stake Consensus Mechanisms: DPoS, LPoS and BPoS
  51. 51. Bedrock: the epileptic curve that ensures security!
  52. 52. What is Tendermint, and how does it work?
  53. 53. Pantos: how to solve the problem of token transfer between blockchains?
  54. 54. What is asymmetric encryption?
  55. 55. Base-58 Function in Cryptocurrencies
  56. 56. What Is the Nostr Protocol and How Does It Work?
  57. 57. What Is the XDAI Bridge and How Does It Work?
  58. 58. Solidity vs. Rust: What Are the Differences Between These Programming Languages?
  59. 59. What Is a Real-Time Operating System (RTOS)?
  60. 60. What Is the Ethereum Rinkeby Testnet and How Does It Work?
  61. 61. What Is Probabilistic Encryption?
  62. 62. What is a Pinata in Web 3? We explain!
  63. 63. What Is EIP-4337? Will Ethereum Account Abstraction Change Web3 Forever?
  64. 64. What are smart contract audits? Which companies are involved?
  65. 65. How does the AirGapped wallet work?
  66. 66. What is proto-danksharding (EIP-4844) on Ethereum?
  67. 67. What is decentralised storage and how does it work?
  68. 68. How to Recover Cryptocurrencies Sent to the Wrong Address or Network: A Practical Guide
  69. 69. MPC Wallet and Multilateral Computing: Innovative Technology for Privacy and Security
  70. 70. Threshold signature in cryptography: an advanced signing technique!
  71. 71. Vanity address in cryptocurrencies: what is it and what are its characteristics?
  72. 72. Reentrancy Attack on smart contracts: a threat to blockchain security!
  73. 73. Slither: a static analyser for smart contracts!
  74. 74. Sandwich Attack at DeFi: explanation and risks!
  75. 75. Blockchain RPC for Web3: A key technology in the world of decentralized finance!
  76. 76. Re-staking: the benefits of re-posting in staking!
  77. 77. Base: Evolving cryptocurrency transactions with a tier-2 solution from Coinbase
  78. 78. IPFS: A new era of decentralized data storage
  79. 79. Typical vulnerabilities and bridge security in blockchain technology
Lesson 48 of 79
In Progress

48. What are RPC nodes, and how do they work?

Decentralized applications (dApps) require data from the blockchain to positively complete a specific user request. This can be sending transactions, retrieving block data or even evaluating the state of a particular blockchain. This is possible through Remote Procedure Call Data (RPC)nodes that connect dApps to the blockchain. Such RPC nodes allow Web3 applications to interact with a particular blockchain and easily access user data.

Today we will take a closer look at RPC nodes and discuss how they work. By the end of the lesson, you will already know exactly what such nodes are.

RPC procedures – what are they?

RPC procedures are a communication protocol that allows clients to communicate with a remote programme, in this case a server located on another network. And all this without having to know the server’s network.

We can use RPC from a computer to request resources from a remote server system. As a client, we make such a request and force the server to execute such a procedure, which is called a subroutine.

In the blockchain, decentralized dApp applications need such data from the blockchain to function properly. In this case, dApps is the client and the server is the RPC node.

RPC nodes – what are they?

An RPC node is a computer that has a client software blockchain. For example, it is a server that supports both the execution layer (EL) and the consensus layer (CL) of the Ethereum blockchain infrastructure.

In the Ethereum network, there are different types of nodes: lightweight, full and archived. The opposite is Solana, where developers can run both validator and RPC nodes. Validator nodes in Solana run Solana’s consensus protocol and receive rewards for block validation. Solana’s RPCs only act as a gateway for the Solana dApp and receive information about the blockchain.

How do remote procedure call (RPC) nodes work?

RPC is largely based on a client-server structure. Nodes are initiated by a client application that sends a specific request to the blockchain. Such a request is the name/information of a function or procedure to be executed. It also contains all the necessary parameters.

The Blockchain receives the request and executes it. If further parameters or additional function information are required, the blockchain retrieves them from the client request. The result is then returned to the client dApps.

Remote procedure call nodes require niche specialists experienced in blockchain development. dApps have different RPC models, so this knowledge requires continuous development and certification.

RPC architecture

RPC nodes consist of several components:

  • Server. This is where the client’s request comes in and the requested functions are executed.
  • Client. The client component initiates the RPC and sends the request to the server.
  • Communication protocols. TCP/IP. They enable communication between client and server components.
  • Network configuration. RPC nodes require a network connection between client and server components. This can be done in many ways, including local area networks (LANs), wide area networks (WANs) and the Internet.
  • Security. It is also of paramount importance when configuring an RPC node. Firewalls, secure protocols and access controls must be implemented to ensure the security of such a node.
  • Management of the RPC node. For a node to function properly, it must be managed and maintained on an ongoing basis. This involves monitoring the network connection and the server component, as well as ensuring that the software is up to date. This increases the need for qualified engineers with experience in blockchain technology.

Using RPC nodes

Nodes can be found in the following areas, among others:

  • Distributed applications. Nodes are useful for creating applications where all application logic is distributed across multiple systems.
  • dApps. Nodes help create a seamless interface between the application and the chain of blocks.
  • System integration. RPC helps in integrating legacy systems with new applications. Thus, they enable communication between systems that use different protocols and technologies for their operation.
  • Creating an interactive interface. Nodes help wallets with multi-domain settings to create an interactive interface. This allows multiple nodes to interact with different chains and share information across different networks.
  • Building applications with open microservices. Yes, RPC nodes are useful for this as well.
  • Processing large blocks of data. With RPC nodes, we can make multiple calls and queries. This can even include searching for a specific block to encrypt the wallet present in dApps.

Why are RPCs so important for the blockchain?

For one simple reason. Using RPC nodes helps both developers and users themselves to use and create dApps.

Instead, the client gets the default option to interact with web servers and blockchain. This gives it access to the information it needs to perform an action or transaction across different wallets.

For example, if you connect your cryptocurrency wallet to a blockchain-based application, the required information is only passed to the blockchain via RPC nodes.


RPC nodes are software components that enable communication between applications, systems, and services. They are used to call various procedures or functions in applications on remote systems.

In addition, RPCs simplify the process of creating and integrating applications and make it easier to add new features and functions. However, to understand an RPC node well, one must first understand its architecture and components.

The use of RPC nodes continues to grow. This indicates increased user interest in applications. This is a good time to benefit from this boom and acquire knowledge about RPC.