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docs/evm/cadence/batched-evm-transactions.md

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Integrating Cadence into EVM applications on Flow enables developers to leverage the best of both worlds. This guide
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demonstrates how to batch EVM transactions using Cadence, allowing applications to embed multiple EVM transactions in a
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single Cadence transaction, conditioning final execution on the success of all EVM transactions.
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single Cadence transaction while conditioning final execution on the success of all EVM transactions.
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This feature can supercharge your EVM application by unlocking experiences otherwise impossible on traditional EVM
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platforms.
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- Run a Cadence transaction from the browser using [Flow Runner]
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- Install conceptual understanding of Cadence X EVM interactions
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- Inspect multiple EVM transactions embedded in a Cadence transaction with [Flowscan] block explorer
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- Write code that interacts with the EVM via a COA
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- Write code that interacts with the EVM via a CadenceOwnedAccount (COA)
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## Prerequisites
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1. **Batching EVM transactions** using Cadence
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2. **Conditioning execution** on the results of those EVM transactions.
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However, using these same principles, you'll have the power to address much more complex and interesting. For instance,
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replace wrapping FLOW with a DEX swap. Or instead of minting an ERC721, purchase an NFT listing from a marketplace.
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Combine these two and suddenly you can purchase NFTs with any ERC20 token, all in a single Cadence transaction,
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reverting everything if a single step fails.
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However, using these same principles, you'll have the power to address more complex use cases. For instance, replace
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wrapping FLOW with a DEX swap. Or instead of minting an ERC721, purchase an NFT listing from a marketplace. Combine
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these two and suddenly you can purchase NFTs with any ERC20 token, all in a single Cadence transaction, reverting
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everything if a single step fails.
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The point is, while a simple use case, this guide will give you the tools to build much more complex and interesting
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applications. So let's get started!
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- Approving an ERC721 to transfer WFLOW in exchange for an NFT mint
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- Minting an ERC721 token
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Before interacting with these contracts, let's dig in a bit more into the components of this guide.
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Before interacting with these contracts, let's dig bit more into the components of this guide.
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### Wrap FLOW as WFLOW
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Importantly, if this transaction fails, we want to revert the entire sequence of transactions. After all, you wrapped
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FLOW to WFLOW and approved the ERC721 transfer specifically to mint this NFT. If the mint fails, you want to unwind
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everything. This is where batching EVM transactions using Cadence is extremely powerful.
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everything. As we'll see shortly, this is where batching EVM transactions using Cadence is extremely powerful.
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## Interacting with the Contracts
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:::tip
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Recall in [Prerequisites] that you need to have both MetaMask and Flow Wallet installed and funded with Testnet FLOW.
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Make sure you've done so before proceeding.
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Recall in [Prerequisites] that you need to have both [MetaMask] and [Flow Wallet extension] installed and funded with
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Testnet FLOW. Make sure you've done so before proceeding.
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:::
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Cadence. This orientation - that of EVM running within Cadence - means that the Cadence-side explorer has visibility to
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EVM transactions embedded within a Cadence transaction.
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Practically, this means that any transactions ran using a Flow account can be viewed on the Cadence explorer while any
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transactions run using an EVM account can be viewed on the EVM explorer.
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Practically, this means that any transactions ran using a Flow native account can be viewed on the Cadence explorer
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while any transactions run using an EVM account can be viewed on the EVM explorer.
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:::
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#### Recap
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This process is cumbersome and requires multiple transactions, each of which could fail. Given the intent of the process
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- minting an NFT - if this were a case where the NFT was a limited edition or time-sensitive, you'd be left with WFLOW
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This process is cumbersome and requires multiple transactions, each of which could fail. Given the intent of the process -
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minting an NFT - if this were a case where the NFT was a limited edition or time-sensitive, you'd be left with WFLOW
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wrapped and approved for transfer, but no NFT and would need to manually unwind the process.
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Or you could just use Cadence to batch these transactions and revert everything if the mint fails. Let's do that.
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### Using Flow Wallet
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Before diving into the how, let's execute the batched version of everything we just did using Flow Wallet. This will
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Before diving into the "how", let's execute the batched version of everything we just did using Flow Wallet. This will
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give you a sense of the power of Cadence and the Flow blockchain.
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The transaction below, like all Cadence transactions, is scripted, allowing us to execute a series of actions. It may
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[WFLOW]: https://evm-testnet.flowscan.io/token/0xd3bF53DAC106A0290B0483EcBC89d40FcC961f3e?tab=write_contract
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[here]: https://docs.soliditylang.org/en/v0.8.28/units-and-global-variables.html#ether-units
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[MaybeMintERC721]: https://evm-testnet.flowscan.io/address/0x2E2Ed0Cfd3AD2f1d34481277b3204d807Ca2F8c2?tab=write_contract
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[`wrap_and_mint.cdc`]: https://run.dnz.dev/snippet/4fe0d43fdaf968b9
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[`wrap_and_mint.cdc`]: https://run.dnz.dev/snippet/c99b25e04a2d1f28
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[Flowscan Cadence]: https://testnet.flowscan.io/
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[resource]: https://cadence-lang.org/docs/solidity-to-cadence#resources
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[entitlement]: https://cadence-lang.org/docs/language/access-control#entitlements

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