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Each user, ONLY by using a core wallet (the eMark-qt), supports the entire eMark network by (since the software runs in the background) forwarding blocks and confirming transactions. A so-called "light wallet" (e.g. Android or iOS), which has not downloaded the complete blockchain and also cannot perform the complex calculations to confirm transactions, does not provide such support. Thus, only users who use the eMark-qt wallet can generate PoS blocks - i.e. "interest".
Every single transfer represents, metaphorically speaking, a "coin" for the eMark network. Thus, there can be coins with the value of 0.0001 DEM, 10,000 DEM or even 236.9453 DEM. Over time, several coins of different ages accumulate on an eMark address, depending on how long ago the last transaction took place. For example, if you pay 23 DEM to someone with such a 108 DEM coin, the "change" is again a coin of 85 DEM (108 DEM minus 23 DEM). With each transfer the coin age is set to 0. Thus, as in the example, the 23 days old 108 DEM coin, after paying 23 DEM has become a 85 DEM coin, which is now 0 days old. These coins are also called "coin blocks".