Bitcoin Block 181919 Reaches Record Size
Bitcoin block 181919, mined on May 27, 2012, sets a new network record for block size at 499,240 bytes, demonstrating a surge in transaction volume.
On May 27, 2012, Bitcoin block 181,919 was mined and, at the time, set a record for the largest block recorded on the network. The block size was precisely 499,240 bytes (approximately 0.476 MB), which was the largest transaction volume recorded in a single block since the network's inception. This event demonstrated a sudden, temporary spike in transaction demand following the dominance of SatoshiDice and its high volume of on-chain transactions (see Event 4036).
While this size was still well within the original 1 MB block size limit, it represented nearly 50% of the maximum capacity. It was a subtle signal to developers and miners that the network's capacity, while not yet maxed out, was already becoming a point of technical observation, foreshadowing the scaling debates to come.