BOB: how it works, supply and reviews
In short
- Type
- Hybrid ZK rollup on Ethereum built on the OP Stack
- Issuance
- BOB token supply can change through governance-controlled issuance
- Risks and caveats
- Most system contracts can be upgraded by a 4-of-6 multisig, and a Guardian multisig can pause all withdrawals.
- Checked
- 31 October 2026
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Key facts
- Ticker
- BOB
- Official site
- gobob.xyz
Key facts checked on 31 October 2026 against official sources.
What is BOB
BOB is a hybrid Layer 2: an OP Stack rollup on Ethereum that uses ZK proofs to settle disputes and is adding Bitcoin-based security through BitVM and BTC-staked finality providers. BOB Gateway lets users move native BTC into DeFi on BOB and other chains through liquidity providers. BOB is also the name of its ERC-20 token.
Network and consensus
| Parameter | Details |
|---|---|
| Type | Hybrid ZK rollup on Ethereum built on the OP Stack |
| Consensus | Kailua: optimistic proposals every 12 hours, disputes settled with ZK proofs; finality after 4 days or instantly with a validity proof |
| Smart contracts | Full EVM compatibility |
| Chain ID | Mainnet chain ID 60808 |
| Launched | Block 1 on 11 April 2024 (official RPC) |
| Bitcoin bridge | BitVM bridge (1-of-n security) on testnet; docs gave a Q4 2025 mainnet target |
Supply and issuance
| Parameter | Details |
|---|---|
| Issuance | BOB token supply can change through governance-controlled issuance |
| Bridging | BOB token moves only via Chainlink CCIP: lock/unlock on BOB, burn/mint on Ethereum and BNB Chain |
What BOB is used for
- Protocol reward token and liquidity incentives
- Gas subsidies on BOB
- Governance through the BOB DAO (gov.gobob.xyz)
Who develops and governs BOB
- Developer
- Built by the BOB Collective
- Upgrade keys
- L1 and L2 Proxy Admins, System Config Owner and Guardian are 4-of-6 multisigs; the Guardian can pause all withdrawals
- Token admin
- BOB token contracts share a 2-of-4 admin multisig, with a plan to move to 3-of-4
- Sequencing
- BOB runs Kailua in vanguard mode: its proposer has priority; others may propose after 30 days of inactivity
History
| Date | Event |
|---|---|
| — | BOB mainnet produces block 1. |
| February 2025 | Kailua hybrid ZK dispute system audited before BOB's upgrade to a hybrid ZK rollup. |
| 31 October 2026 | LayerZero endpoint on BOB closes; wBTC.OFT can no longer leave BOB, with a user deadline extended to 15 December 2026. |
Security and audits
- Kailua, BOB Gateway, USDC bridge and FusionLock contracts each have published audit reports.
- Anyone can challenge an invalid state proposal by staking 0.5 ETH; disputes are resolved by ZK proofs.
- Users can force-withdraw to Ethereum through the native bridge even if the sequencer is offline.
Security incidents
No security incident is recorded in the sources checked on 31 October 2026 (the company’s own channels and incident databases): defillama.com/hacks, hacked.slowmist.io/search, rekt.news/leaderboard, gobob.xyz/en/blog, forum.gobob.xyz/search.json, docs.gobob.xyz/docs/reference/audits, docs.gobob.xyz/docs/reference/privileged-roles
Official BOB contracts
| Network | Contract address |
|---|---|
| BOB | 0xb0bd54846a92b214c04a63b26ad7dc5e19a60808 |
| Ethereum | 0xC9746F73cC33a36c2cD55b8aEFD732586946Cedd |
| BNB Smart Chain | 0x52B5fB4B0F6572B8C44d0251Cc224513ac5eB7E7 |
Gas on BOB is paid in ETH; BOB is an ERC-20 token on BOB, Ethereum and BNB Smart Chain.
Risks and caveats
- Most system contracts can be upgraded by a 4-of-6 multisig, and a Guardian multisig can pause all withdrawals.
- BTC on BOB is mostly wrapped BTC or staking tokens whose backing is held by their own issuers, not by BOB.
- The BOB proposer has priority in vanguard mode, and finality without a validity proof takes 4 days.
Official links
- Website: www.gobob.xyz
- Docs: docs.gobob.xyz
- Source code: github.com/bob-collective/bob
- Block explorer: explorer.gobob.xyz
- Governance: gov.gobob.xyz/dao
- Blog: www.gobob.xyz/en/blog
Questions and answers
What is BOB?
BOB is a hybrid Layer 2: an OP Stack rollup on Ethereum that settles disputes with ZK proofs and is adding Bitcoin security via BitVM. BOB Gateway brings native BTC into DeFi.
Who holds the BTC on BOB?
BOB Gateway liquidity providers swap BTC into wrapped BTC or BTC staking tokens, so the BTC sits with those tokens' issuers; the BitVM bridge was still on testnet.
Who can upgrade BOB?
Most system contracts are upgradable by a 4-of-6 multisig, and a Guardian multisig can pause withdrawals.
What is the BOB token used for?
It is a reward and incentive token used for liquidity incentives, gas subsidies and ecosystem alignment, bridged via Chainlink CCIP.
Sources
- BOB — Home
- BOB Docs — What is BOB
- BOB Docs — Hybrid Chain
- BOB Docs — BitVM on BOB
- BOB Docs — BOB token
- BOB Docs — Privileged roles
- BOB Docs — Audits
- BOB Docs — Networks
- BOB Docs — BOB Gateway
- BOB Blog — wBTC migration
- BOB mainnet RPC — block 1
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