BitGo, Kyber and Republic Unveil Bitcoin-Backed WBTC for Ethereum

BitGo, Kyber Network and Republic Protocol on October 26, 2018 announced Wrapped Bitcoin, or WBTC, a planned ERC-20 token intended to represent bitcoin on Ethereum. The initiative said each WBTC would be backed by one bitcoin held in custody, with a January 2019 launch target.

The proposal mattered because Bitcoin and Ethereum were separate settlement systems. Bitcoin could not be used directly by an Ethereum smart contract, while Ethereum applications generally expected ERC-20 tokens. WBTC proposed a standardized representation that could circulate inside Ethereum without changing either base protocol.

A bridge built around custody

The October 26 design assigned distinct roles to a custodian, merchants and a governing group. BitGo was named as the initial custodian. Kyber and Republic Protocol were named as the first merchants, responsible for distributing newly minted tokens and handling exchanges between BTC and WBTC.

Under the announced model, WBTC would be created only when an equivalent amount of bitcoin was held by the custodian. When backing bitcoin was withdrawn, the corresponding WBTC would be burned. Because the bitcoin reserve and the Ethereum token supply would both be visible on public blockchains, users could compare the two ledgers. That was the proposal’s proof-of-reserves claim; it was not the same as an independent audit of custody controls.

A multisignature-controlled organization, described as the WBTC DAO, was intended to approve additions or removals of merchants and custodians and consider system changes. The project materials said merchants would provide know-your-customer and anti-money-laundering checks for users interacting through them. MakerDAO, Compound, Dharma, AirSwap, IDEX, DDEX, Hydro Protocol, Set Protocol, Radar Relay, Gnosis and Prycto were identified as launch participants or supporters.

Why the design mattered

The immediate use case was liquidity. An ERC-20 representation of bitcoin could be listed by Ethereum-based decentralized exchanges and incorporated into lending, token-payment and other smart-contract applications using the same interfaces already used for Ethereum tokens. Developers would not need to add a Bitcoin node and Bitcoin-specific transaction logic merely to represent BTC-denominated value inside an Ethereum application.

But the design did not move native bitcoin onto Ethereum. Users would receive an Ethereum token representing a claim on bitcoin controlled by a custodian. Its reliability therefore depended on correct minting and burning, secure custody, honest merchants, functioning governance and the continuing redeemability of the token. Public reserve addresses could make an imbalance observable, but transparency alone could not eliminate operational, legal or counterparty risk.

That tradeoff was the institutional significance of the October 26 announcement. WBTC treated interoperability as a coordination and custody problem rather than waiting for a trustless cross-chain protocol. It offered a practical route to combine Bitcoin liquidity with Ethereum programmability, while making the trust boundary more explicit than the word “wrapped” might suggest.

What was known on October 26

WBTC was an announced initiative on October 26, 2018, not a live asset. The project targeted January 2019 and said full specifications would be opened for discussion before launch. No circulating supply, reserve balance, trading volume or market price existed to verify on the event date, so this reconstruction makes no event-day performance claim.

Later context

A later project release dated January 31, 2019 said WBTC had launched on Ethereum. That confirmation is included only to close the announced timeline; it was not information available on October 26, 2018.