// Flow Wallet - mainnet Script batchBridgeNFTToEvm - v2.0 // iOS-2.1.11-5 import FungibleToken from 0xf233dcee88fe0abe import FlowToken from 0x1654653399040a61 import MetadataViews from 0x1d7e57aa55817448 import ViewResolver from 0x1d7e57aa55817448 import NonFungibleToken from 0x1d7e57aa55817448 import ScopedFTProviders from 0x1e4aa0b87d10b141 import EVM from 0xe467b9dd11fa00df import FlowEVMBridgeUtils from 0x1e4aa0b87d10b141 import FlowEVMBridge from 0x1e4aa0b87d10b141 import FlowEVMBridgeConfig from 0x1e4aa0b87d10b141 /// Bridges an NFT from the signer's collection in Cadence to the signer's COA in FlowEVM /// NOTE: The NFT being bridged must have first been onboarded to the bridge. This can be checked for with the method /// FlowEVMBridge.typeRequiresOnboarding(type): Bool? /// /// @param nftContractAddress: The Flow account address hosting the NFT-defining Cadence contract /// @param nftContractName: The name of the NFT-defining Cadence contract /// @param id: The Cadence NFT.id of the NFT to bridge to EVM /// transaction(nftContractAddress: Address, nftContractName: String, ids: [UInt64]) { let nfts: @{UInt64 : {NonFungibleToken.NFT}} let coa: auth(EVM.Bridge) &EVM.CadenceOwnedAccount let scopedProvider: @ScopedFTProviders.ScopedFTProvider prepare(signer: auth(CopyValue, BorrowValue, IssueStorageCapabilityController, PublishCapability, SaveValue) &Account) { /* --- Reference the signer's CadenceOwnedAccount --- */ // // Borrow a reference to the signer's COA self.coa = signer.storage.borrow(from: /storage/evm) ?? panic("Could not borrow COA from provided gateway address") self.nfts <- {} /* --- Retrieve the NFT --- */ // // Borrow a reference to the NFT collection, configuring if necessary let viewResolver = getAccount(nftContractAddress).contracts.borrow<&{ViewResolver}>(name: nftContractName) ?? panic("Could not borrow ViewResolver from NFT contract") let collectionData = viewResolver.resolveContractView( resourceType: nil, viewType: Type() ) as! MetadataViews.NFTCollectionData? ?? panic("Could not resolve NFTCollectionData view") let collection = signer.storage.borrow( from: collectionData.storagePath ) ?? panic("Could not access signer's NFT Collection") // Withdraw the requested NFT & calculate the approximate bridge fee based on NFT storage usage let currentStorageUsage = signer.storage.used for id in ids { let nft <- collection.withdraw(withdrawID: id) self.nfts[id] <-! nft } // self.nft <- collection.withdraw(withdrawID: id) let withdrawnStorageUsage = signer.storage.used let approxFee = FlowEVMBridgeUtils.calculateBridgeFee( bytes: currentStorageUsage - withdrawnStorageUsage ) * 1.10 * UFix64(ids.length) /* --- Configure a ScopedFTProvider --- */ // // Issue and store bridge-dedicated Provider Capability in storage if necessary if signer.storage.type(at: FlowEVMBridgeConfig.providerCapabilityStoragePath) == nil { let providerCap = signer.capabilities.storage.issue( /storage/flowTokenVault ) signer.storage.save(providerCap, to: FlowEVMBridgeConfig.providerCapabilityStoragePath) } // Copy the stored Provider capability and create a ScopedFTProvider let providerCapCopy = signer.storage.copy>( from: FlowEVMBridgeConfig.providerCapabilityStoragePath ) ?? panic("Invalid Provider Capability found in storage.") let providerFilter = ScopedFTProviders.AllowanceFilter(approxFee) self.scopedProvider <- ScopedFTProviders.createScopedFTProvider( provider: providerCapCopy, filters: [ providerFilter ], expiration: getCurrentBlock().timestamp + 1.0 ) } execute { // Execute the bridge var idx = 0 while idx < ids.length { let nftId = ids[idx]! let nft <- self.nfts.remove(key: nftId)! as @{NonFungibleToken.NFT} self.coa.depositNFT( nft: <- nft!, feeProvider: &self.scopedProvider as auth(FungibleToken.Withdraw) &{FungibleToken.Provider} ) idx = idx + 1 } // Destroy the ScopedFTProvider destroy self.scopedProvider destroy self.nfts } }

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Transaction

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