# Sum Coin Age (SCA)

Sum Coin Age ( SCA ) is the sum value of products of coins unspent transaction output alive days and its value.

Sum Coin Age ( SCA ) is the sum value of products of coins unspent transaction output alive days and its value.

Sum Coin Age (SCA) is sum of ‘Alive days’ combining the days of all coins that was in a kept single wallet. SCA has a tendency to increase in value in principle because more BTC is being mined and not all BTC move all the time.

**Sudden decrease**: Coins that were dormant moved in mass-**Volatility Risk or Possible Trend Reversal****Continuous rise**: the total days of coins alive accumulatesContinuous rise in SCA is normal in general but could turn to sell pressure when price begins to rise in sudden.