âBrowser mining, when done ethically using an opt-in only system, can provide a real alternative for webmasters who donât want to display ads. Visitors can contribute to a websites cost of content by providing small amounts of surplus processing power while on the siteâJames Bachini CEO of JSEcoin Greener technologies are being developed across all industries and the blockchain sector will eventually need to follow suit. Proof of stake algorithms such as the Casper update for Ethereum could bring the environmental cost down but for Bitcoin it seems unlikely that anything similar would gain approval due to the control that the miners have over the network. It simply wouldnât be in their best interest to vote for a system that made their mining hardware obsolete. There are only a small number of projects currently developing browser based blockchains. JSEcoin mentioned above has had a live platform since August 2017 and is launching an ICO in July. Nimiq has recently issued a new token (NIM) to replace their (NET) ERC20 token. Monero (XMR) is often mined in web browsers by hidden background web based scripts such as Coinhive.