On-chain vs. Lightning payments
Bitcoin can move in two fundamentally different ways: directly on the Bitcoin blockchain, which is called on-chain, or through the Lightning Network, which runs as a second layer on top of it. Both involve real Bitcoin. The difference is in how they move, how fast, and at what cost.
Understanding both helps you make the right choice for whatever you are trying to do.
On-chain payments
An on-chain Bitcoin transaction is recorded directly on the Bitcoin blockchain. It is permanent, fully public, and settled within about 10 to 60 minutes depending on how busy the network is. Once it has enough confirmations, it cannot be reversed or altered by anyone.
On-chain transactions require a fee paid to miners who process and validate the transaction. These fees fluctuate based on network demand. During busy periods, fees can rise significantly. During quiet periods, they can be very low.
On-chain is the right choice for large transfers, final settlement, moving Bitcoin to long-term storage, or any situation where permanence and security matter more than speed or cost.
Lightning payments
A Lightning payment moves Bitcoin through off-chain payment channels. It settles in one to three seconds. Fees are typically less than one cent, regardless of the amount sent. There is no block confirmation wait.
Lightning is the right choice for small purchases, frequent transfers, tipping, or any situation where you want Bitcoin to behave like a fast digital payment.
A side-by-side comparison
- Settlement time: On-chain takes 10 to 60 minutes. Lightning takes 1 to 3 seconds.
- Fees: On-chain fees vary with network congestion, sometimes several dollars. Lightning fees are fractions of a cent.
- Best for: On-chain works well for large transfers and permanent settlement. Lightning works best for small, frequent payments.
- Privacy: On-chain transactions are permanently public. Lightning payments are less visible on the public blockchain.
- Finality: On-chain is the gold standard for permanent settlement. Lightning is final but relies on channel liquidity.
Which one does Astra use?
When Astra purchases Bitcoin on your behalf through Coinbase, that Bitcoin is held on the Bitcoin base layer, which is on-chain. This is appropriate for a savings and accumulation product where security and custody matter most.
When you eventually move or spend your Bitcoin, whether you send it to a friend, move it to a hardware wallet, or pay for something, you will choose between on-chain and Lightning based on the situation. For large moves to cold storage, use on-chain. For small everyday payments, Lightning is the right tool.
On-chain for saving and settling. Lightning for spending and sending. Both are Bitcoin.