What does “sign” mean in blockchain?

When you “sign” in blockchain, you’re not signing plain text—you’re signing a hashed version of data.Here’s a simplified technical flow:Step 1: Create transactionIncludes:Sender addressReceiver addressAmountFee Nodes in the blockchain check:Does the signature match the public key?Has the transaction been altered?Is the sender authorized?If any check fails ❌ → transaction is rejected

Private key = your secret pen

Signature = your handwritten approval

Blockchain = public record that verifies your signatureIf you want next-level detail, I can explain:

How ECDSA math actually works

How hackers exploit signatures

Step-by-step signing demo in MetaMask

Always read what you’re signing

Use hardware wallets for safety

Avoid unknown dApps

Revoke unnecessary permissions

On platforms like Ethereum:

You sign interactions with smart contracts

Example:

Approving token spending

Minting NFTs

Swapping tokens

Each action = a signed transaction