# BOB Developer Docs - The Bank of Bitcoin > BOB is the Bank of Bitcoin. Get started building in the BTCFi ecosystem where you can swap, save, earn and borrow - all on Bitcoin rails. # BOB Documentation For Gateway developer documentation (API reference, SDK integration): - Gateway docs: https://docs.gobob.xyz/gateway/ - Gateway llms.txt: https://docs.gobob.xyz/gateway/llms.txt ## Table of Contents - [Bitcoin Vaults and Liquidation Engine](https://docs.gobob.xyz/bitvm/bitcoin-vaults): Bitcoin vaults enable native BTC as collateral for lending and stablecoins on DeFi chains like Ethereum, Base, BOB, and Solana. Using BitVM technol... - [BitVM: A New Paradigm for Bitcoin](https://docs.gobob.xyz/bitvm): import BitvmDiagram from "./bitvm-diagram.svg"; - [Resources](https://docs.gobob.xyz/bitvm/resources): - [BitVM2: Bridging Bitcoin to Second Layers](https://bitvm.org/bitvm_bridge.pdf) - [BitVM on BOB](https://docs.gobob.xyz/bitvm/roadmap): :::info - [Run a Full Node](https://docs.gobob.xyz/bob-chain/full-node): :::info - [Hybrid Chain](https://docs.gobob.xyz/bob-chain/hybrid-chain): BOB is a _Hybrid Chain_, a new kind of Hybrid ZK Rollup that inherits Bitcoin finality while providing trust-minimized bridges directly to Ethereum... - [Hybrid Nodes](https://docs.gobob.xyz/bob-chain/hybrid-nodes): Hybrid Nodes are technical infrastructure providers that operate core BOB services. All node operators on BOB are called "Hybrid Nodes" and serve c... - [BOB Chain Overview](https://docs.gobob.xyz/bob-chain): BOB is a Hybrid Chain that combines Bitcoin's security with Ethereum's DeFi innovation. - [Bitcoin Light Client](https://docs.gobob.xyz/bob-chain/relay): We have chosen to use the production-ready [**tBTC-v2**](https://github.com/keep-network/tbtc-v2/blob/main/solidity/contracts/relay/LightRelay.sol)... - [Hybrid Stack](https://docs.gobob.xyz/bob-chain/stack-overview): The BOB ecosystem is built as a layered stack that enables seamless interaction between Bitcoin and Ethereum ecosystems, providing users with crypt... - [Transactions](https://docs.gobob.xyz/bob-chain/transactions): BOB inherits its transaction mechanics from the [OP Stack](https://docs.optimism.io/stack/transactions), providing users with fast, cost-effective ... - [BOB Pay](https://docs.gobob.xyz/deprecated/bob-pay): :::warning Deprecation Notice - [Account Abstraction (ERC-4337)](https://docs.gobob.xyz/deprecated/bridged-btc-gas-fee/account-abstraction): In this example, we will show how wBTC can be used for gas fee payment using the [ERC-4337 account abstraction standard](https://eips.ethereum.org/... - [Pay Fees with BTC](https://docs.gobob.xyz/deprecated/bridged-btc-gas-fee): On Ethereum rollups, gas fees need to be paid in ETH as the base currency. While a rollup can in theory choose to use their gas token, part of the ... - [Meta Transactions (ERC-2771)](https://docs.gobob.xyz/deprecated/bridged-btc-gas-fee/meta-transactions): In this example, we will show how wBTC can be used for gas fee payments using the OpenGSN and [ERC-2771 standard](https://eips.ethereum.org/EIPS/ei... - [Hello Bitcoin](https://docs.gobob.xyz/deprecated/hello-bitcoin): import Tabs from "@theme/Tabs"; - [Local Development](https://docs.gobob.xyz/deprecated/local-development): import Tabs from '@theme/Tabs'; - [BOB Bitcoin MetaMask Snap](https://docs.gobob.xyz/deprecated/metamask-snap): MetaMask Snaps allow us to add features and functionality to the standard MetaMask wallet. - [Give Users Free Transactions](https://docs.gobob.xyz/deprecated/safe-gas-station): BOB believes that users deserve next-gen UX, including abstracting away the complexity of transaction fees from users. That's why we're partnered w... - [What is BOB?](https://docs.gobob.xyz/): BOB is the Bank of Bitcoin. Get started building in the BTCFi ecosystem where you can swap, save, earn and borrow - all on Bitcoin rails. - [Connect Wallet & Bridge Assets](https://docs.gobob.xyz/quick-start/connect-wallet): import AddToWallet from '@site/src/components/AddToWallet'; - [Make Your First Transaction](https://docs.gobob.xyz/quick-start/first-transaction): Complete your first transaction on BOB to experience the power of Bitcoin-secured DeFi. - [Quick Start](https://docs.gobob.xyz/quick-start): BOB is the Bank of Bitcoin. Get started building in the BTCFi ecosystem where you can swap, save, earn and borrow - all on Bitcoin rails. - [What is BOB?](https://docs.gobob.xyz/quick-start/what-is-bob): BOB is the Bank of Bitcoin. Get started building in the BTCFi ecosystem where you can swap, save, earn and borrow - all on Bitcoin rails. - [Audits](https://docs.gobob.xyz/reference/audits): BOB is based on the OP Stack and relies on the extensive [security reviews](https://github.com/ethereum-optimism/optimism/tree/v1.1.4/technical-doc... - [BOB Token Reference](https://docs.gobob.xyz/reference/bob-token): This page aggregates the information most partners need to integrate the BOB token across supported networks. The on-chain contracts themselves rem... - [Bug Bounty Program](https://docs.gobob.xyz/reference/bug-bounty): BOB maintains a comprehensive bug bounty program to help secure our protocol and protect our users. We have up to $250,000 in max payout available.... - [Contracts](https://docs.gobob.xyz/reference/contracts): - [Light Relay](/docs/bob-chain/relay): [`0x9fe7ef727da3d79e0308ff43f31ea1d077ee9f41`](https://explorer.gobob.xyz/address/0x9fe7ef727da3d79e0308ff4... - [Founder Resources](https://docs.gobob.xyz/reference/founder-resources): Whether you're a Bitcoin native looking to leverage EVM capabilities or an Ethereum builder ready to tap into Bitcoin's potential, BOB provides the... - [Governance: Whitelisted Delegates](https://docs.gobob.xyz/reference/governance): For information about BOB's governance and whitelisted delegates, please refer to our governance documentation: - [Reference](https://docs.gobob.xyz/reference): Technical reference for BOB Chain, BitVM, and Gateway SDK. - [Privileged Roles in BOB Mainnet](https://docs.gobob.xyz/reference/privileged-roles): BOB uses the [OP Stack](https://docs.optimism.io/stack/getting-started) as its foundation and has upgraded to a [hybrid zk rollup](/docs/bob-chain/... - [Research at BOB](https://docs.gobob.xyz/reference/research): Technological advantage stems from persistent and rigorous research. - [Token Registry](https://docs.gobob.xyz/reference/token-registry): import tokenListData from '@gobob/tokenlist/tokenlist.json'; - [Account Abstraction](https://docs.gobob.xyz/tools/account-abstraction): BOB supports multiple account abstraction solutions, including the latest EIP-7702 standard introduced with Ethereum's Pectra upgrade. This enables... - [Block Explorers](https://docs.gobob.xyz/tools/block-explorers): [Blockscout](https://www.blockscout.com/) is a comprehensive blockchain explorer for BOB that provides detailed information about transactions, blo... - [Cross-chain](https://docs.gobob.xyz/tools/cross-chain): BOB has chosen Chainlink’s [Cross-Chain Interoperability Protocol (CCIP)](https://chain.link/cross-chain) as its canonical bridge solution. CCIP wi... - [Data Indexers](https://docs.gobob.xyz/tools/data-indexers): [Goldsky](https://goldsky.com/) is a data indexer for web3 builders, offering high-performance subgraph hosting and realtime data replication pipel... - [Developer Tools](https://docs.gobob.xyz/tools/developer-tools): [Tenderly](https://tenderly.co/) is a comprehensive blockchain development platform that provides a suite of tools for building, testing, and monit... - [Builder Tools](https://docs.gobob.xyz/tools): BOB is fully EVM compatible and built on the OP Stack, making it easy for Ethereum developers to deploy and use their favorite tools on BOB. Below ... - [Node Providers](https://docs.gobob.xyz/tools/node-providers): Follow [Conduit's guide](https://docs.conduit.xyz/guides/run-a-node/op-stack-node) to run your own BOB node. Search "BOB" on their [Browse rollups ... - [Onboarding](https://docs.gobob.xyz/tools/onboarding): With Universal Bridge, your users can **onramp, bridge, and swap** on any EVM chain — with any EVM token or fiat — thanks to its **automatic cross-... - [Oracles](https://docs.gobob.xyz/tools/oracles): [Acurast](https://acurast.com/) is a zero-trust application platform with universal interoperability. - [Rust zkVM](https://docs.gobob.xyz/tools/rust-zkvm): The [RISC Zero zero-knowledge virtual machine](https://dev.risczero.com/api/zkvm/) (zkVM) lets you prove correct execution of arbitrary Rust code i... - [Social Login](https://docs.gobob.xyz/tools/social-login): The [Arcana Network](https://arcana.network) SDKs enable web3 developers to use [social login](https://docs.arcana.network/concepts/social-login) t... - [BOB Fusion](https://docs.gobob.xyz/user-hub/bob-fusion): BOB Fusion is the official points program of BOB, where users can harvest BOB Spice (points) based on their on-chain activity on the BOB mainnet. B... - [User Hub](https://docs.gobob.xyz/user-hub): Welcome to BOB's User Hub - your gateway to Bitcoin-secured DeFi. Bridge assets, earn yield, and explore the ecosystem. - [Networks](https://docs.gobob.xyz/user-hub/networks): BOB Mainnet is the production network where real value is at stake. Use this network for: - [Bridge with Binance Web3 Wallet](https://docs.gobob.xyz/user-hub/onboard-to-bob/binance-wallet-gateway): [BOB Gateway](https://app.gobob.xyz) lets you stake, swap, or lend your BTC from a single, unified interface so you can put your bitcoin to work ea... - [Bridge from Bitcoin to BOB](https://docs.gobob.xyz/user-hub/onboard-to-bob/bob-gateway): [BOB Gateway](https://docs.gobob.xyz/gateway) lets you stake, swap, or lend your bitcoin from a single, unified interface so you can put your bitco... - [Bridge from Ethereum to BOB](https://docs.gobob.xyz/user-hub/onboard-to-bob/ethereum-bridge): The [BOB Bridge](https://app.gobob.xyz/bridge) allows you to move ETH between Ethereum and BOB. - [Guides: Bridge to BOB](https://docs.gobob.xyz/user-hub/onboard-to-bob): There are several ways to bridge tokens to and from BOB, depending on which network and token you're interested in moving. Here is an overview of y... - [Guide: Stake BTC](https://docs.gobob.xyz/user-hub/stake-btc): [BOB Earn](https://app.gobob.xyz/stake?type=stake&stakeWith=solv-solvbtcbbn) is a new 1-click Bitcoin staking portal and [BOB Gateway](https://docs... - [FAQ & Troubleshooting](https://docs.gobob.xyz/user-hub/troubleshooting): - **No!** Your existing Ethereum wallet (MetaMask, Rabby, Safe, or Ledger address) works on BOB. - [Wallets](https://docs.gobob.xyz/user-hub/wallet-guide): import AddToWallet from '@site/src/components/AddToWallet';