Just curious, what is the average confirmation time for a deposit to be confirmed on an exchange( ie poloniex.com)?
how many confirmations are needed?
thanks
Actually, I figure it out.
poloniex requires 18 confirmations.
however, where can i find the confirmations progress on the NEM blockchain???
I tried http://chain.nem.ninja/ but
i can’t seem to find anything related to confirmations count # on http://chain.nem.ninja/#/blocks/0
Each block created after the block your transaction was added to behaves as a “confirmation” on a blockchain. This makes it pretty easy to calculate, the confirmation count is: current_block_height - the_block_height 
“Confirmation count needed” is not defined per-se. You can use whatever count you wish. Poloniex uses 18 confirmations as you mentioned because it makes it harder for a hacker to fake a payment. Here a more in-depth explanation of blockchain’s confirmation count security: https://bitcointalk.org/index.php?topic=112041.msg1212557#msg1212557
You must understand that in crypto currency, there is no such “central authority” who you can trust about “yes your customer paid”. In systems like Bitcoin where block time target is 10 minutes, this is a big problem, because it gives room to double spend, transaction replay, counterfeiting coins etc. So eventually people came to the conclusion that before they consider a transaction as completed, they want to be sure that the transaction is included in the best chain. This means that the blockchain has continued to grow on top of the block containing your transaction. Bottom line, each block added means 1 block more to replay for the hacker.
have a good day!
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thank you! that’s a great answer.
glad i could help!