The number of block confirmations on every cryptocurrency varies. Please check the list below to learn of the confirmations required for a transfer into your Koin wallet - 

Bitcoin (2 block confirmations)
Litecoin (6 block confirmations)
Ethereum (24 block confirmations)
Ripple (no block confirmations)
Bitcoin Cash (8 block confirmations)
ERC20 tokens (24 block confirmations)
STELLAR (no block confirmations)
NEO (1 block confirmations)
GAS (1 block confirmations)
NANO (1 block confirmations)