Bitcoin has surged to $72,000, yet remains within a significant supply zone, according to on-chain data. Analyst Ali Martinez highlighted the UTXO Realized Price Distribution (URPD), which shows a major cost-basis cluster between $63,100 and $73,200. This range indicates where a substantial amount of Bitcoin was last purchased, suggesting that many investors are now in profit. However, Bitcoin has not yet exited this range, which could influence investor behavior. Martinez noted that investors within this cluster are likely to defend their buy-in prices, potentially impacting Bitcoin's ability to break past the $73,200 mark. Beyond this range, the URPD suggests thinner supply until $82,000, indicating potential for less resistance if Bitcoin moves higher. Meanwhile, Ethereum's URPD shows significant clusters at $2,079 and $1,882, with the cryptocurrency currently trading above these levels.