Nasdaq announced on February 11, 2019 that it would begin distributing real-time Bitcoin Liquid Index and Ethereum Liquid Index levels through its Global Index Data Service on February 25. The planned addition put two cryptocurrency reference rates into an established market-data channel used by financial institutions and data vendors.
The development mattered because cryptocurrency prices were formed across fragmented, continuously operating trading venues rather than through one official closing auction. A consolidated reference rate could make those markets easier to monitor and support contracts or analytical systems requiring a defined benchmark. Nasdaq’s notice did not, however, create bitcoin or ether trading on a Nasdaq exchange.
What Nasdaq announced
Nasdaq identified the instruments as BLX, the Bitcoin Liquid Index, and ELX, the Ethereum Liquid Index. Both were produced by cryptocurrency data company Brave New Coin. Each was designed to express the U.S.-dollar price of one unit of its underlying asset using data from what the provider regarded as the most liquid portions of the relevant markets.
The proprietary GIDS feed was scheduled to transmit both index levels every 30 seconds beginning February 25, 2019. Nasdaq also planned to carry directory messages and end-of-session summary messages associated with the indexes. The February 11 notice classified the change as affecting all markets receiving the data service.
Nasdaq said BLX calculations extended back to 2010 and ELX calculations to 2014. Those dates described the available index histories, not the start of Nasdaq dissemination and not a claim that identical live feeds had existed throughout those periods.
The exchange operator also said the methodology had been independently audited against key principles from the International Organization of Securities Commissions. That was an attributable statement about alignment and an audit. It should not be interpreted as IOSCO approval, government regulation of the indexes, or validation of every constituent venue and observation.
A data connection, not a new crypto market
The institutional importance was narrower—and more concrete—than some cryptocurrency adoption narratives suggested. Nasdaq was adding third-party benchmark information to a data-distribution system. It was not listing bitcoin or ether as securities, launching a spot exchange, approving an exchange-traded fund, guaranteeing benchmark accuracy or taking custody of either asset.
Even so, placing BLX and ELX in conventional market-data plumbing reduced an operational divide between cryptocurrency venues and established financial systems. Subscribers could receive normalized identifiers, U.S.-dollar denominations and regular updates through infrastructure already designed to carry indexes. That made the announcement relevant to price discovery, risk monitoring and the possible design of financial products, without establishing that any particular product would follow.
The surviving records do not disclose the number of GIDS subscribers expected to use the cryptocurrency fields, the fees attributable to them, or any completed trades based on the indexes. They also do not demonstrate that the February 11 announcement caused a bitcoin or ether price movement. Coinburn therefore makes no event-day return, volume or market-capitalization claim.
Evidence and uncertainty
The central facts are directly established by Nasdaq’s dated technical notice: the instruments, provider, currency, 30-second frequency and scheduled February 25 start. Contemporaneous CoinDesk reporting independently described the planned addition on February 13.
Brave New Coin reported on February 26 that Nasdaq had begun carrying BLX and ELX. That subsequent confirmation supports completion of the scheduled rollout but does not change what was knowable on February 11: Nasdaq had announced a future data-feed addition, not an already-operational service.
The durable significance of the February 11 development was market infrastructure rather than an immediate trading event. It supplied conventional data consumers with defined cryptocurrency reference rates while leaving the underlying assets, constituent exchanges and associated risks outside Nasdaq’s own trading venue.
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