It's the latest big name to back Ethereum's Proof-of-Stake blockchain, with Tether and Circle also pledging to embrace the newly upgraded chain.
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OpenSea has announced that it's throwing its support behind The Merge — and will only support NFTs based on Ethereum's new Proof-of-Stake blockchain.
It comes as a small number of miners threaten to fork the network and create an alternative form of ETH that continues to be based on a Proof-of-Work blockchain.
In a statement on Twitter, the world's biggest NFT marketplace says forked non-fungible tokens "won't be supported or reflected on OpenSea."
And acknowledging that The Merge is a significant upgrade that could cause disruption, OpenSea says it has been preparing for a smooth transition, adding:
"While we don't anticipate major issues, we also acknowledge this is a first! So we’re committed to monitoring, managing, and communicating throughout."
Some of the biggest names in the crypto industry have also declared that they'll be backing proof-of-stake going forward.
Circle, which issues USDC, said:
"We are excited about the future scaling opportunities it unlocks as well as the reduced energy consumption profile of the network."
And while it stopped short of speculating on the possibility of forks, the company added:
"USDC as an Ethereum asset can only exist as a single valid 'version.'"
Tether said that — to ensure there's no disruption to DeFi products or platforms — it's important that the transition "is not weaponized to cause confusion and harm within the ecosystem."
The Merge is set to be completed in the middle of September.