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img width: 750px; iframe.movie width: 750px; height: 450px; Onekey extension wallet setup and features guide Onekey extension wallet setup and features guide Download the plugin from the Chrome Web Store or Firefox Add-ons page. Verify the publisher is the official team by checking the total user count (over 2 million) and reading recent reviews for phishing reports. After installation, click the toolbar icon and select "Create a New Vault". Write down the 12-word recovery phrase on paper–never screenshot or store it in cloud storage. The phrase is the only way to restore access if your device fails. The interface supports three network modes by default: Ethereum mainnet, BNB Smart Chain, and Polygon. To add a custom chain, open the settings menu and input the RPC URL manually. For example, enter https://rpc.ankr.com/eth for Ethereum. Disable the "Auto-detect Networks" option to reduce connection errors on slower connections. Each transaction requires a signature via the hardware device–press the physical button on your vault to confirm sending 0.01 ETH or approving a smart contract. Token management is straightforward: click the "Manage Assets" button to import ERC-20 tokens by contract address. For BEP-20 tokens on BSC, switch the network first. The built-in swap function uses 0x API for routing, with a 0.3% fee per trade. Set a custom gas limit below 50,000 for simple transfers to save on fees. Monitor your vault's firmware version under "Device Settings"–update it monthly to patch security holes. Disconnect the hardware when not signing to prevent remote exploits. Onekey Extension Wallet Setup and Features Guide Download the plugin directly from the Chrome Web Store or Firefox Add-ons page. After installing, pin it to your browser toolbar so the icon remains visible. Avoid third-party download links; validate the publisher explicitly reads "OneKey" with a verified checkmark. During initialization, click "Create a new vault." Write down the provided 12-word mnemonic phrase using a metal backup device, not paper. Store this plate in two separate fireproof locations. Never photograph or type this phrase digitally; a clipboard leak exposes all assets. For import, select "Recover using recovery phrase." Input your existing 12 or 24-word seed precisely, with single spaces between each term. The tool accepts BIP39 standard phrases from any compliant provider. Hardware bridging occurs automatically when a connected Ledger or Trezor device is detected–USB or Bluetooth pairing is handled on-device. The interface organizes accounts into distinct color-coded profiles. Each profile holds its own transaction history and connected dApps. To isolate high-risk interactions, create separate profiles for DeFi farming and long-term storage. Profile data remains siloed at the injection level. Network configuration supports EVM chains natively: Ethereum, BNB Smart Chain, Polygon, Arbitrum, and Optimism. For non-EVM chains like Solana or Bitcoin, toggle the multi-chain switch in advanced settings. Each chain displays its native gas token balance prominently in the top bar. Transaction approvals require three confirmations: a visual simulation of the contract call, a gas fee estimate in both fiat and native token, and a final authorization prompt. Simulations run locally without sending data to external servers. Reject any request where the simulated output exceeds 1% of your portfolio value. Hardware device integration bypasses software key vulnerabilities. When a hardware wallet is paired, approval prompts display the device’s physical screen message. The browser extension only relays signed transactions; private keys never reside in the plugin’s memory. Session timeouts for hardware connections default to 5 minutes–reduce this to 30 seconds for sensitive operations. Built-in swap aggregator queries five DEX sources per chain to find the best execution price. Slippage tolerance defaults to 0.5%; raise it to 1.5% only for low-liquidity tokens. The tool shows the estimated price impact before you commit. If the impact exceeds 2%, consider splitting the order into smaller increments. How to Install the Onekey Extension on Chrome and Firefox Open Chrome Web Store and search for the official plug-in developed by the OneKey team. Verify the publisher name listed as "[https://web3-extension.com/wallet/onekey.php Connect OneKey Wallet to dApp]" directly below the add-on title. Click "Add to Chrome" and confirm the permissions dialog. The tool requests access to read and change website data on specific domains like etherscan.io and opensea.io; this is necessary for injection and transaction signing. Denying this permission breaks core functionality. Once installed, the icon appears in the top-right toolbar. Pin it via the puzzle icon for persistent visibility. For Firefox, navigate to the Mozilla Add-ons store. Enter "OneKey" in the search bar. Locate the add-on with the highest number of user reviews and a badge indicating it is a Recommended extension. Click "Add to Firefox" and approve the requested permissions, which include access to data for all websites. This broader permission scope is standard for Firefox implementations; it does not mean the tool reads your browsing history. Installation completes with a confirmation toast. You must restart the browser or reload existing tab sessions to activate the injected script. After adding the software to either browser, click the icon and select "Create a new profile." The program automatically generates a 12-word recovery phrase. Write this phrase on paper only–screenshots or cloud storage compromise security. Set a local password that encrypts the private keys stored in your browser’s local storage. This password is independent of any exchange or blockchain passwords. The tool uses AES-256-GCM encryption locally. If you lose this password, you must re-import using the recovery phrase. Verify installation integrity by opening the browser’s developer console and checking for injected global variables. On a supported domain like uniswap.org, run `window.ethereum.isOneKey` in the console. A return value of `true` confirms correct injection. If `undefined` appears, disable other competing providers like MetaMask or Rabby, as only one injector can set the `window.ethereum` provider per site. Check the "Manage extensions" page on Chrome (`chrome://extensions`) or Firefox (`about:addons`) to ensure the toggle is enabled and the version number matches the latest release on GitHub. Step-by-Step Wallet Creation and Seed Phrase Backup Process Initiate the creation of a new cryptographic vault by first downloading the specific software client from the official project repository or a verified app store, ensuring the source checksum matches the published hash. During the launch, explicitly select the option to generate a new identity rather than recover an existing one. The local machine will then produce a deterministic sequence of 24 words, derived from a high-entropy random number generator, which functions as the ultimate root key for all derived accounts. Avoid skipping any on-screen confirmation steps that test your immediate comprehension of this initial procedure. When the 12 or 24-word mnemonic phrase appears on screen–a direct representation of your private master key–you must record it exclusively on a physical medium, such as a fireproof steel plate or a piece of paper stored in a safe deposit box. Never copy this sequence into a text file, cloud note, screenshot, or any internet-connected device, as any digital exposure introduces a permanent attack vector. Verify the legibility of your handwriting immediately, misreading even one character can render the entire string useless for future recovery. Proceed through the validation prompt where the application asks you to select specific words from your mnemonic in the correct order. This confirmation ensures you have physically recorded the phrase without relying on memory retention alone. If you fail this verification, the software will not finalize the vault creation, forcing you to restart the entire genesis process. Treat a successful validation as the bare minimum prerequisite before trusting this system with any asset. After the confirmation, the vault will initialize with a default primary address derived from the first path in the BIP-44 hierarchy. Immediately upon first access, execute a test transaction: send a negligible amount of a testnet token or a minimal mainnet unit (e.g., 0.0001 of the base currency) to the public address, then perform a recovery drill by deleting the application from your system and restoring access solely from your physical seed backup. This single practice run exposes any errors in your backup method before actual funds are at risk. Store your physical seed backup in a minimum of two geographically separate locations, each protected against fire, flood, and unauthorized access. For long-term custody, use metal blanks stamped with the mnemonic; paper backups degrade within years under standard humidity. Do not encrypt the phrase–encryption adds a passphrase layer that, if forgotten, destroys access, whereas plain physical custody relies only on the strength of your isolation protocols. Never photograph the words, never type them into a search engine, and never show them to a screen recording service during support sessions. Managing Multiple Blockchains: Adding and Switching Networks in Onekey To add a new chain, open the network selector at the top of the interface and click "Add Network." Paste the RPC URL, chain ID, symbol, and block explorer URL exactly as provided by the chain’s documentation. For example, for Polygon, use the public RPC at https://polygon-rpc.com and chain ID 137. Incorrect chain IDs will cause transactions to fail silently. You can manage up to 20 custom networks simultaneously. Each network entry stores its own token list and transaction history locally. Switching between them takes less than one second–simply click the network name in the dropdown menu. The current balance displays only assets native to that specific chain. Open "Settings" and locate the "Networks" tab under "Advanced." Enable auto-detect for common chains like BNB Smart Chain, Arbitrum, or Avalanche C-chain; this populates standard RPC endpoints and chain IDs without manual entry. For testnets like Goerli or Sepolia, toggle the "Show Test Networks" option in the same menu. When switching to a less common chain, verify the RPC is responsive. A typical timeout error appears if the endpoint is overloaded–try alternative RPCs from chainlist.org. Avoid using deprecated endpoints; many chains archive old URLs after twelve months. For instance, the original BSC mainnet RPC changed from https://bsc-dataseed.binance.org to a load-balanced set. Add via chain ID lookup: In the "Add Network" dialog, enter only the chain ID; if the chain is registered, the software fills RPC and explorer fields automatically. This works for ERC-20 compatible chains like Optimism (ID 10) or zkSync Era (ID 324). Manual verification: After adding, send a small test transaction (0.0001 native token) to a trusted address. Confirmation within 30 seconds indicates correct configuration. Cross-chain transfers require a bridge; the network selector alone does not move assets. Use the "Send" function only after confirming you are on the correct chain. Mistakenly sending BEP-20 tokens to an ERC-20 address results in unrecoverable loss–double-check both chain and address format before confirming. To remove a custom network, navigate to "Networks," find the entry, and click "Delete." This action purges all local token data for that chain. If you later re-add the same network, token balances must reload from the blockchain–a process that takes between 2 and 10 seconds depending on block height. For privacy, each network maintains separate account nonce counters; switching chains does not affect the nonce on other networks. This prevents accidental nonce reuse, which can cause pending transaction conflicts. Always clear pending transactions on the previous chain before switching if you plan to broadcast from the same address. Q&A:

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