3/30/2011
👨💻 Bitcoin v0.6 Arrives
Faster sync, QR codes, and wallet backups – on March 30, 2011, Bitcoin v0.6 made running a node easier than ever. The update cut sync time, added message signing, and shrank transactions with compressed keys.
Source:
https://archive.bitcoin-calendar.org/archive/1748728478.764221/index.html