# Token Bridge **Base Bridge: If you are looking for the Base network bridge instead, please visit** [**bridge.ainetwork.ai**](https://bridge.ainetwork.ai)**.** > ***Please contact before proceeding.*** The code below contains deprecated elements and may no longer function correctly. It is intended for expert users and partner developers who possess a detailed understanding of the AIN blockchain architecture and its underlying mechanics. \ This guide assumes that you have an Ethereum wallet with some AIN ERC20 tokens in it. You can buy AIN ERC20 tokens on Uniswap, Balancer, or GOPAX. #### AIN ERC20 Token Addresses * Mainnet: [0x3A810ff7211b40c4fA76205a14efe161615d0385](https://etherscan.io/address/0x3a810ff7211b40c4fa76205a14efe161615d0385) * Testnet (ropsten): [0xB16c0C80a81f73204d454426fC413CAe455525A7](https://ropsten.etherscan.io/address/0xB16c0C80a81f73204d454426fC413CAe455525A7) #### AIN Native Token Pool Addresses * Mainnet * Ethereum: [0x00CC50B6DC70cC854B1231272FDe0b0CFE561d72](https://etherscan.io/address/0x00CC50B6DC70cC854B1231272FDe0b0CFE561d72) * AI Network: [0x00CC0491CdA2dA91385C9c424852Ae096B7AbD89](https://insight.ainetwork.ai/accounts/0x00CC0491CdA2dA91385C9c424852Ae096B7AbD89) * Testnet * Ethereum: [0x00AA9daA2aC950fF445B435Af7F6c39C5c65D677](https://ropsten.etherscan.io/address/0x00aa9daa2ac950ff445b435af7f6c39c5c65d677) * AI Network: [0x00AA7d797FB091AF6dD57ec71Abac8D2066BE298](https://testnet-insight.ainetwork.ai/accounts/0x00AA9daA2aC950fF445B435Af7F6c39C5c65D677) ## Check-in Here, a check-in refers to a transfer of your AIN ERC20 tokens on Ethereum to AI Network as AIN native coins. ### 1. Send your AIN ERC20 tokens to the AI Network ERC20 Token Pool address. #### 1-1. Using a MetaMask, Add AIN ERC20 Token to your list of tokens. ![1. Click import tokens](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2FPo2zx8juZ74btFlh2Gpt%2FScreen%20Shot%202022-01-09%20at%204.54.44%20PM.png?alt=media\&token=b2496fed-81c6-4bc8-8678-937136d901d1) ![2. Enter the AIN ERC20 address](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2FR6Mtbj1TflloZ8HVOEjR%2FScreen%20Shot%202022-01-09%20at%204.57.17%20PM.png?alt=media\&token=a8077b15-3df1-48f8-9b00-3743400ea251) ![3. Click Import Tokens](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2FCzLVF5xWjsUKuwmgCNgh%2FScreen%20Shot%202022-01-09%20at%204.57.34%20PM.png?alt=media\&token=333b3df5-c251-49aa-89b3-7f4255f38b4e) #### 1-2. Send AIN ERC20 to AI Network ERC20 Token Pool. AI Network ERC20 Token Pool address * Mainnet: [0x00CC50B6DC70cC854B1231272FDe0b0CFE561d72](https://etherscan.io/address/0x00CC50B6DC70cC854B1231272FDe0b0CFE561d72) * Testnet: [0x00AA9daA2aC950fF445B435Af7F6c39C5c65D677](https://ropsten.etherscan.io/address/0x00aa9daa2ac950ff445b435af7f6c39c5c65d677) :warning:Make sure you are on the right network (Ethereum Mainnet vs Ropsten Test Network) before sending your assets. There is no minimum/maximum amount you need to check-in. ![1.Click send](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2Fy2L352uR9gW4PQ0pKlLe%2FScreen%20Shot%202022-01-09%20at%205.03.44%20PM.png?alt=media\&token=616e40f4-b7f3-4dc3-bb9a-bafb3b2eacb9) ![2. Enter the AI Network ERC20 Token Pool address](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2FBZNaFwqZbslo3XXGFz9w%2FScreen%20Shot%202022-01-11%20at%209.29.33%20PM.png?alt=media\&token=1dde709d-c50a-4ae4-b65b-8d1e268f96c5) ![3. Confirm](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2FkaEjEMuIvkQV83NhhpIW%2FScreen%20Shot%202022-01-11%20at%209.30.09%20PM.png?alt=media\&token=e10ccf36-116b-42a8-8a09-5e513fb72a51) #### 1-3. Make sure the transaction is successfully executed. You can view your transaction on Etherscan by clicking the transaction on MetaMask and then "View on block explorer". ![Click View on block explorer to see your transaction on Etherscan.](https://4104943086-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LjeN2V5wGI_euAIynMR%2Fuploads%2Fm0fBZ77QSvm2FeBxATYl%2FScreen%20Shot%202022-01-11%20at%209.31.03%20PM.png?alt=media\&token=d464fdcb-bb77-4e4d-8a18-b2465e83ef46) ### 2. Send a check-in request transaction to the AI Network blockchain. {% code title="check-in-mainnet.js" %} ```javascript /* This code snippet is for Mainnet! */ const stringify = require('fast-json-stable-stringify'); const Accounts = require('web3-eth-accounts'); const Ain = require('@ainblockchain/ain-js').default; const ain = new Ain('https://mainnet-api.ainetwork.ai', 1); // chainId = 1 (mainnet) const ethAccounts = new Accounts(); const ainErc20TokenAddress = '0x3A810ff7211b40c4fA76205a14efe161615d0385'; ​ // Create 1 new account const accounts = ain.wallet.create(1); // WARNING: Make sure to record this private key somewhere safe! We cannot retrieve it for you! console.log(JSON.stringify(ain.wallet.accounts, null, 2)); const myAddress = accounts[0]; ain.wallet.setDefaultAccount(myAddress); // Or, import an account you already have // const myAddress = ain.wallet.addAndSetDefaultAccount(YOUR_PRIVATE_KEY); // Create a sender proof with your Ethereum key (sender) const timestamp = Date.now(); const ref = `/checkin/requests/ETH/1/${ainErc20TokenAddress}/${myAddress}/${timestamp}`; // Should be exactly the same as the AIN ERC20 token you sent in Step 1-2. const amount = 20000; // Sender is the Ethereum address that you used to send AIN ERC20 token in Step 1-2. const sender = 'YOUR-ETHEREUM-ADDRESS'; const senderPrivateKey = 'YOUR-ETHEREUM-PRIVATE-KEY'; const senderProofBody = { ref, amount, sender, timestamp, nonce: -1, }; const senderProof = ethAccounts.sign(ethAccounts.hashMessage(stringify(senderProofBody)), senderPrivateKey).signature; // Send a check-in request ain.db.ref(ref) .setValue({ value: { amount, sender: myAddress, sender_proof: senderProof, }, nonce: -1, gas_price: 500, timestamp: timestamp // Should be the same as the checkinId in ref }) .then((res) => { console.log(JSON.stringify(res, null, 2)); }); ``` {% endcode %} {% code title="check-in-testnet.js" %} ```javascript /* This code snippet is for Testnet! */ const stringify = require('fast-json-stable-stringify'); const Accounts = require('web3-eth-accounts'); const Ain = require('@ainblockchain/ain-js').default; const ain = new Ain('https://testnet-api.ainetwork.ai', 0); // chainId = 0 (testnet) const ethAccounts = new Accounts(); const ainErc20TokenAddress = '0xB16c0C80a81f73204d454426fC413CAe455525A7'; ​ // Create 1 new account const accounts = ain.wallet.create(1); // WARNING: Make sure to record this private key somewhere safe! We cannot retrieve it for you! console.log(JSON.stringify(ain.wallet.accounts, null, 2)); const myAddress = accounts[0]; ain.wallet.setDefaultAccount(myAddress); // Or, import an account you already have // const myAddress = ain.wallet.addAndSetDefaultAccount(YOUR_PRIVATE_KEY); // Create a sender proof with your Ethereum key (sender) const timestamp = Date.now(); const ref = `/checkin/requests/ETH/3/${ainErc20TokenAddress}/${myAddress}/${timestamp}`; // Should be exactly the same as the AIN ERC20 token you sent in Step 1-2. const amount = 20000; // Sender is the Ethereum address that you used to send AIN ERC20 token in Step 1-2. const sender = 'YOUR-ETHEREUM-ADDRESS'; const senderPrivateKey = 'YOUR-ETHEREUM-PRIVATE-KEY'; const senderProofBody = { ref, amount, sender, timestamp, nonce: -1, }; const senderProof = ethAccounts.sign(ethAccounts.hashMessage(stringify(senderProofBody)), senderPrivateKey).signature; // Send a check-in request ain.db.ref(ref) .setValue({ value: { amount, sender, sender_proof: senderProof, }, nonce: -1, gas_price: 500, timestamp: timestamp // Should be the same as the checkinId in ref }) .then((res) => { console.log(JSON.stringify(res, null, 2)); }); ``` {% endcode %} ### 3. Check that your AI Network account's balance has increased on Insight. You can check your AI Network account's balance at the AI Network blockchain explorer. * Mainnet: * Testnet: ## Check-out Similarly, a check-out refers to a transfer of your AIN native coins on AI Network to Ethereum as AIN ERC20 tokens. ### 1. Send a check-out request transaction to the AI Network blockchain. For check-out's, there is a minimum and a maximum allowed per request as well as a maximum per day for the entire network. Currently the limits are: * Minimum check-out amount per request: 10,000 AIN * Maximum check-out amount per request: 100,000 AIN * Maximum check-out amount per day for the network: 1,000,000 AIN ```javascript /* This code snippet is for Mainnet! */ const Ain = require('@ainblockchain/ain-js').default; const ain = new Ain('https://testnet-api.ainetwork.ai', 1); // chainId = 1 (mainnet) const ainErc20TokenAddress = '0x3A810ff7211b40c4fA76205a14efe161615d0385'; ​ // Import an account you created in the check-in process const myAddress = ain.wallet.addAndSetDefaultAccount(YOUR_PRIVATE_KEY); // Send a check-in request const timestamp = Date.now(); const ref = `/checkout/requests/ETH/1/${ainErc20TokenAddress}/${myAddress}/${timestamp}`; const amount = 10000; // This is the Ethereum address that will receive the AIN ERC20 tokens const recipient = 'YOUR-ETHEREUM-ADDRESS'; ain.db.ref(ref) .setValue({ value: { amount, recipient, fee_rate: 0.001 }, nonce: -1, gas_price: 500, timestamp: timestamp // Should be the same as the checkoutId in ref }) .then((res) => { console.log(JSON.stringify(res, null, 2)); }); ``` ```javascript /* This code snippet is for Testnet! */ const Ain = require('@ainblockchain/ain-js').default; const ain = new Ain('https://testnet-api.ainetwork.ai', 0); // chainId = 0 (testnet) const ainErc20TokenAddress = '0xB16c0C80a81f73204d454426fC413CAe455525A7'; ​ // Import an account you created in the check-in process const myAddress = ain.wallet.addAndSetDefaultAccount(YOUR_PRIVATE_KEY); ​ // Send a check-in request const timestamp = Date.now(); const ref = `/checkout/requests/ETH/3/${ainErc20TokenAddress}/${myAddress}/${timestamp}`; const amount = 10000; // This is the Ethereum address that will receive the AIN ERC20 tokens const recipient = 'YOUR-ETHEREUM-ADDRESS'; ain.db.ref(ref) .setValue({ value: { amount, recipient, fee_rate: 0.001 }, nonce: -1, gas_price: 500, timestamp: timestamp, // Should be the same as the checkoutId in ref }) .then((res) => { console.log(JSON.stringify(res, null, 2)); }); ``` ### 2. Check that your transaction was successfully added to the blockchain on Insight. You can view your transaction at: * Mainnet: * Testnet: ### 3. Check that your Ethereum wallet has received AIN ERC20 tokens. You can confirm your increased AIN ERC20 token balance on either MetaMask or Etherscan. * Mainnet: * Testnet: