Hi We are looking to improve Ethviewer http://ethviewer.live If you're a user of it or just curious, please check it out and complete the short survey via the green survey call to action button at the top right of the screen. Thanks!
There's a lot of metrics in the transactions can be used as parameters to generate sounds. Things like tx value, gas price, gas used can be mapped to a pitches or chords. Contract creation and invocation could trigger other sounds. Block creation yet another sound and so on
Bitlisten has been around a long time and uses these ideas which has also inspired Etherlisten (seems down ATM)
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