Private Key
16/04/2026
A private key is a secret number generated when a cryptocurrency wallet is created. It is used to cryptographically sign transactions, proving ownership of the funds at an address without revealing the key itself.
Whoever controls the private key controls the funds. There is no password recovery — if the key is lost, the funds are permanently inaccessible.
Private key, public key, and address
These three are mathematically related:
Private key → (one-way function) → Public key → (hash) → Address
- Private key — kept secret; used to sign transactions
- Public key — derived from private key; shared openly
- Address — derived from public key; the "account number" you give others to receive funds
The derivation is one-way: knowing the address or public key does not reveal the private key.
Seed phrase
Modern wallets don't ask users to manage raw private keys. Instead they generate a seed phrase (12 or 24 words) that encodes the master private key. From this single seed, thousands of addresses and private keys can be derived.
Backing up the seed phrase = backing up all your keys.
Security rules
- Never share your private key or seed phrase with anyone
- Never enter them on websites or in software you don't fully trust
- Store the seed phrase offline (paper or metal backup), not on a computer
- Use a cold wallet for large balances
