OpenSea Seaport v1.4 has been deployed and will be put into use

ChainCatcher news, OpenSea protocol development lead 0age tweeted that OpenSea Seaport v1.4 has been deployed and is now in use. This version improves upon some issues present in v1.2 and v1.3, and the "developer preview" version is not recommended for production.

It is reported that Seaport is used for securely and efficiently buying and selling NFTs, allowing bidders to offer some ETH / ERC20 / ERC721 / ERC1155 items, while also supporting a "tip" feature. (source link)