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A Layer 2 payment protocol moves some payment activity off a blockchain’s base layer while keeping a defined connection to that chain for funding, settlement, security, or dispute resolution. It is a category, not one universal protocol: Bitcoin’s Lightning Network uses payment channels, while Ethereum rollups execute transactions separately and submit data to Ethereum.
What is a Layer 2 payment protocol?
“Layer 2” describes a design that handles activity away from a blockchain’s base layer, often called Layer 1, but relies on that base chain in a specific way. The connection may support funding, transaction data, settlement, or enforcement when participants disagree. The details depend on the design; Layer 2 systems do not all inherit the same security model.
That is why the phrase does not identify one particular protocol. To understand a Layer 2 payment system, ask which base chain it uses, how payments are processed, and what the base chain can enforce.
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Payment channels: balances update off-chain
A payment channel begins with funds committed on-chain. Participants then approve updated versions of the balance split and exchange value without recording every update on the base chain. The chain can become relevant again when a channel is opened or closed, or when a dispute needs to be resolved. Ethereum.org describes this two-way ledger model for state channels: State Channels.
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Bitcoin’s Lightning Network is a payment-channel network. Its channels hold bitcoin on the Bitcoin network, while signed transactions update how the channel funds are divided. If participants disagree or one fails to cooperate, on-chain transactions provide an enforcement path. The Lightning Network BOLTs introduction describes the design as “a protocol for making fast payments with Bitcoin using a network of channels.” Read the BOLTs introduction.
Lightning: payments can route across channels
A Lightning payment does not necessarily require the sender and recipient to share a direct channel. Routing nodes can connect a path through multiple peer-to-peer channels. The route must have enough capacity to carry the payment, so channel connectivity and liquidity matter. Lightning Labs’ overview describes channels, routing, and invoices, which carry payment details.
Rollups: execution happens separately
Rollups are another Layer 2 pattern, but they are not payment-channel networks. They execute transactions separately, bundle activity, and submit transaction data to Ethereum. In optimistic rollups, a disputed transaction can be re-executed on Ethereum through a verifier contract. See Ethereum.org’s Layer 2 overview and optimistic rollup documentation.
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| Comparison | Lightning | Ethereum rollups |
|---|---|---|
| Base chain relationship | Bitcoin channels are funded on the Bitcoin network; on-chain transactions can enforce channel outcomes. | Transaction data is submitted to Ethereum, while execution happens separately. |
| Payment mechanism | Participants update channel balances off-chain; payments can route across linked channels. | Transactions are executed separately and bundled for submission to Ethereum. |
| Disputes and enforcement | Relevant on-chain transactions provide enforcement if participants disagree or fail. | For optimistic rollups, disputed transactions can be re-executed on Ethereum through a verifier contract. |
| What to evaluate | Route availability, channel capacity, and what the Bitcoin chain can enforce. | How transaction data reaches Ethereum and how the rollup’s verification process handles disputes. |
These are different mechanisms, so “Layer 2” alone does not tell you how a payment works or what protections it has. Compare the system’s specific chain relationship, settlement process, routing needs, and security assumptions.
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Is Bitcoin’s Payment Protocol the same as Layer 2?
No. BIP 70, titled “Payment Protocol,” is a merchant-customer messaging specification, not a blockchain scaling network. It defines checkout messages such as PaymentRequest, Payment, and PaymentACK, covering details like payment destinations and acknowledgements. The proposal is dated 2013-07-29 in the BIP 70 specification.
The Bitcoin.org Developer Guide labels the older Payment Protocol deprecated and says it is slated for removal in a later Bitcoin Core version. That deprecation concerns the checkout messaging specification; it is separate from whether a system is a Layer 2 payment network. See the guide’s Payment Processing section.
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