Every Ethereum Classic account is secured by public-key cryptography. Understanding how keys and addresses work is fundamental to safe interaction with the network.
The Key Pair
Private Key
A private key is a randomly generated 256-bit number — essentially a number between 1 and approximately 1.158 × 10⁷⁷. This number must be kept secret. Anyone who knows a private key has full control over the associated account.
Public Key
The public key is derived from the private key using elliptic curve multiplication on the secp256k1 curve — the same curve used by Bitcoin. This operation is computationally easy in one direction but infeasible to reverse. Given a public key, there is no known way to determine the private key.
Address
An ETC address is the last 20 bytes (160 bits) of the Keccak-256 hash of the public key, prefixed with "0x". For example: 0x3b0952fB8eAAC74E56E176102eBA70BAB1C81537.
Key Derivation Path
The derivation process follows a chain:
- Random entropy → Private key (256 bits)
- Private key → Public key (secp256k1 elliptic curve multiplication)
- Public key → Address (Keccak-256 hash, take last 20 bytes)
Each step is a one-way function: you cannot reverse the process to recover the previous step.
HD Wallets
Modern wallets use Hierarchical Deterministic (HD) key generation (BIP-32/BIP-44). A single seed phrase (12 or 24 words) deterministically generates an unlimited number of key pairs. ETC uses derivation path m/44'/61'/0'/0 (where 61 is ETC's coin type per SLIP-44).
Security Implications
- Seed phrase = all keys: Anyone with your seed phrase can derive every key your wallet has ever generated
- Private key = account control: There is no password reset. If a private key is lost, the funds are permanently inaccessible
- Address = public identifier: Addresses can be freely shared. They reveal no information about the private key
Checksummed Addresses
EIP-55 mixed-case checksums encode error detection directly into the address string. Wallets should always validate checksums before sending transactions.