Crypto basics: how blockchains and digital assets work
A plain-language look at shared ledgers, public-key cryptography, and how Bitcoin moves value without a central bookkeeper.
1. What are a blockchain and a cryptocurrency?
A blockchain is a database kept by many independent computers. A bank keeps one ledger. A blockchain has many nodes apply the same rules and store the same history.
A cryptocurrency is the native asset of such a network. No central bank issues it. Supply and transfers follow the protocol and whatever consensus the network actually reaches.
2. Public keys, private keys, and addresses
The private key is the control of the coins. The public key is derived from it. An address is a shorter form of that public key.
An address is like an account number: you can share it so others can pay you. The private key and the seed phrase are the control secret. Anyone who has them can move the assets. “Not your keys, not your coins” means custody sits with whoever holds the key.
3. A first step on bitFlyer
After you register and complete the checks the account asks for, you can buy crypto with fiat where that channel is open, or deposit USDT and place a spot order. Availability depends on your region and on the products that are actually enabled.
Takeaways
- 1A shared ledger removes the single operator of a centralized book, but it does not remove market, contract, or key-management risk.
- 2The private key and seed phrase prove control. Do not screenshot them or send them to anyone.
- 3Start with a size you can afford to lose, and learn spot rules before using leverage.
Check it against live markets
Use live markets to review what you read. Fills and fees follow the order you actually place.