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1. Beginner Course

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  1. 1. What are these cryptocurrencies?
  2. 2. Bitcoin - the story of a technological revolution
  3. 3. Satoshi Nakamoto, who is the creator of Bitcoin?
  4. 4. Vitaly Buterin – the creator of Ethereum
  5. 5. What is blockchain, and how does it work?
  6. 6. What is an NFT token?
  7. 7. What is money?
  8. 8. Cryptocurrencies vs fiat money, which will win?
  9. 9. What is DeFi (Decentralized Finance)?
  10. 10. DeFi: opportunities, advantages and disadvantages of decentralized finance
  11. 11. What is an altcoin?
  12. 12. Stablecoins - What are they?
  13. 13. Cryptocurrency wallet - what is it?
  14. 14. Why do we talk about bull and bear markets?
  15. 15. Security in the crypto market - what rules are worth following?
  16. 16. What is the seed phrase in cryptocurrencies?
  17. 17. Dogecoin and memecoin - what are they?
  18. 18. What is a Ponzi scheme?
  19. 19. What is a Soft and Hard Fork?
  20. 20. Blockchain - examples of use
  21. 21. Is blockchain safe?
  22. 22. What are the types of blockchain networks?
  23. 23. What is blockchain network congestion, and how does it work?
  24. 24. Cryptocurrency wallets: Hot Wallet vs. Cold Wallet - key differences!
  25. 25. Cryptocurrency wallet diversification
  26. 26. Halving Bitcoin - what is it, and how does it affect the price?
  27. 27. Blockchain versus databases: key differences!
  28. 28. How do you transfer cryptocurrencies?
  29. 29. The most important cryptocurrency acronyms/slang you need to know!
  30. 30. The memecoin story: madness or great investment?
  31. 31. What is Ethereum? 
  32. 32. Everything you need to know about gas fees in Ethereum!
  33. 33. Gavin Wood: Blockchain Visionary and Co-Founder of Ethereum
  34. 34. Decentralized Apps – what are they?
  35. 35. What is Proof of Work (PoW) and what is Proof of Stake (PoS)?
  36. 36. What is the Proof of Authority (PoA) consensus mechanism?
  37. 37. What is Proof of Burn (PoB)?
  38. 38. What is a whitepaper? What is its purpose, and how do you write it?
  39. 39. Smart Contracts - what are they?
  40. 40. Know your customer (KYC) and Anti-money laundering (AML) what are they in the cryptocurrency industry?
  41. 41. Blockchain and NFT games - how to make money on them?
  42. 42. Liquidity in the cryptocurrency market
  43. 43. Inflation and its effects on financial markets
  44. 44. What is stagflation and why does it have a negative impact on the market?
  45. 45. What are utility tokens and what use do they have in the cryptocurrency sector?
  46. 46. What is cryptocurrency mining?
  47. 47. What is the mining difficulty?
  48. 48. What is compound interest, and how does it work?
  49. 49. What Are Privacy Coins and Are They Legal?
  50. 50. What is CBDC - central bank digital money?
  51. 51. What is Cryptocurrency Airdrop all about?
  52. 52. Key differences between ICO, IEO and STO
  53. 53. What are decentralized DAO organizations, and how do they work? What are DAO tokens?
  54. 54. What is EURT? How does it work?
  55. 55. What is the difference between Circulating Supply and Total Supply?
  56. 56. Snapshot from the world of cryptocurrencies - what is it?
  57. 57. What is the Fear and Greed index for cryptocurrencies?
  58. 58. APR versus APY: what is the difference?
  59. 59. What is an Initial Farming Offer (IFO)?
  60. 60. What is Regenerative Finance (ReFi)?
  61. 61. Who Is Craig Wright, the Alleged Creator of Bitcoin?
  62. 62. What Is Bitcoin (BTC.D) Dominance?
  63. 63. Michael Saylor, Self-Proclaimed Bitcoin Maximalist
  64. 64. Bitcoin Pizza Day
  65. 65. AI blockchain - a new look into the future?
  66. 66. What is WorldCoin? Everything you need to know about this cryptocurrency!
  67. 67. Azuki NFT collection guide: everything you need to know about it!
  68. 68. The 10 most expensive non-fungible tokens (NFTs) ever!
  69. 69. The Bored Ape Yacht Club (BAYC) - the story of the popular NFT collection!
  70. 70. CyberPunks - the story of the most popular NFT collection in the crypto industry!
  71. 71. NFT Art: The digital art revolution - history and examples!
  72. 72. Who is Changpeng Zhao, CEO of Binance?
  73. 73. Who is Brian Armstrong - CEO of Coinbase?
  74. 74. Who is Galy Gensler and the SEC? How does the Securities and Exchange Commission (SEC) affect the cryptocurrency market?
  75. 75. Web3's most popular social media platforms! Will they replace the platforms we know?
  76. 76. What is IoT - the Internet of Things?
  77. 77. On-chain analysis in the cryptocurrency world: Everything you need to know about It
  78. 78. Can you pass on your cryptocurrencies after death? How do you pass on a cryptocurrency inheritance?
  79. 79. What is the Howey test? What application does it have in cryptocurrencies?
  80. 80. The use of blockchain technology in the world of sport
Lesson 21 of 80
In Progress

21. Is blockchain safe?

The title of our lesson today suggests a lot. However, the answer to this question is not straightforward. The nature of the blockchain and its technology means that it is generally secure. Nevertheless, they are many dangers lurking in the world of cryptocurrencies, that it cannot fully guard against.

Security of blockchain technology

Any expert on blockchain technology will assure you that encrypting the blockchain and its data, is the most secure ecosystem in the world. Of course, we tentatively agree, but what are we really talking about? As you know from our previous lessons [Link – what is blockchain and how it works – beginner level], once blocks of data are added to the blockchain, they can no longer be changed.

The blocks are verified using a consensus mechanism that effectively eliminates fraudulent transactions and hacker attacks. Moreover, access to the main base of the network is encrypted. These factors make the blockchain ecosystem one of the most secure yet.

Blockchain vs hackers

We have come to the conclusion that blockchain is very secure.

The entire architecture of the blockchain systems behind cryptocurrencies, NFTs and applications has built-in security features. Once the data is added to the blockchain, the hacker cannot change it. So, how is it possible that millions of cryptocurrencies are attacked by hackers every year?

True, blockchain technology itself is secure, but if we do not maintain basic measures and aren’t concerned about the security of the blockchain and our cryptocurrencies, we expose ourselves and the entire ecosystem to tragedy. What, then, is worth paying attention to?

Security of your equipment. 2FA, not going to suspicious sites or not logging into your cryptocurrency profiles while you are away from your computer. Remember that blockchain accounts are anonymous. One mistake can cost you a lot, and the probability of finding out who is behind it is low.

Strong passwords. Cryptocurrency accounts need to be secured with a strong password that only you know about. If you store your password on your computer – hackers are already rubbing their hands.

Use only Blockchain and DeFi applications that you trust and are verified. Do not log on to suspicious websites or use equally suspicious links.

Don’t easily entrust your money, especially where you are accompanied by any concerns.

Read about cryptocurrency scams. Ponzi schemes, or “pump and dump”. Knowledge allows you to avoid unpleasant situations. In “Pump and dump”, scammers introduce cryptocurrencies or tokens, creating an artificial increase in their price. They use popular websites or social media in their operations. They then quickly disappear from the market and the assets you hold become worthless.

Security on blockchain platforms. What we have already mentioned. Before you transfer your funds, ask what security measures they take. Ask about any certifications and security features.

Don’t go on suspicious sites. The Internet is accessible to everyone and offers information about cryptocurrencies and projects, but not all of them are true and safe.

Use only applications and systems that you trust. New, unproven applications and networks are a great breeding ground for cybercriminals. They can exploit a vulnerability in its code and get the information they need to clean out your wallet. This is something you definitely would not want.

Choose the platforms on which you trade and obtain information about cryptocurrencies and blockchain technology carefully. Many exchanges use measures on par with bank security. 

Also take care with the security of your transaction. Double-check the address you’re sending funds. One mistake, will cost you the entire lost of funds. And for wrongly sending your cryptocurrencies, there is unfortunately no solution. We have written about how to transfer cryptocurrencies securely here.


So, you can see that blockchain itself is secure. Many things really depend on us and our security measures that we use when exploring cryptocurrency platforms daily. Information on how to protect yourself is easy to find. The Blockchain has the right safeguards in place. You, we remind you to protect your assets, do business where it is safe to do so. Moreover, entrust your funds to platforms that are proven.