a list of layer 2 bitcoin and smart contracts built on bitcoin

the lightning network is the most solution but its not the only one in existance

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there are also a list of other chains built on bitcoin

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rsk is a smart contract chain thats built on top of bitcoin

[https://www.rsk.co/](https://www.rsk.co/)

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defi chain is another similar service built on bitcoin but markets itself as turing incomplete

[https://defichain.com/](https://defichain.com/)

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Sovryn is a smart contract defi service thats also built on top of bitcoin

[https://www.sovryn.app/](https://www.sovryn.app/)

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liquid network is a smart contract that is under the control of bitcoin exchanges and maintained by blockstream (in other words its under corporate control)

[https://liquid.net/](https://liquid.net/)

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stacks is a defi smart contract service built on top of bitcoin

[https://www.stacks.co/](https://www.stacks.co/)

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portal defi is in theory supposed to be a defi service built on top of bitcoin but all i see is just a website at the moment

[https://portaldefi.com/](https://portaldefi.com/)