the time was because they only accept 100 transactions per hour and the current round is full (submission beyond limit) so you'll have to wait for the next round which will start in 10 minutes (9 min 15 seconds from this comment's timestamp) 

edit: i successfully submitted your transaction
now all you have to do is wait until ViaBTC finds a block, it may take an hour.

a standard MultiBit HD wallet is BIP32 compatible although they have had some bugs with their compatibility with other implementations.
try importing your seed in Electrum and see if it understands it (i have never tried it so i can not confirm). if it did then you are good to go.

you can always use this https://bitcoin.stackexchange.com/a/49428 (save a copy and use it offline) to get the private keys from your seed and then import them into Electrum.

but the best course of action is generating a new wallet in electrum and transferring funds from your old wallet to this new wallet by spending them (send from old to new).

for now use https://www.viabtc.com/tools/txaccelerator/ to try and accelerate your transaction. if you do it exactly in 29 minutes from creating this post you can get it through their service.

also (take a backup from your seed if you don't have it already) and upgrade your wallet to the latest version. next time try to use the fee slider to include a higher more appropriate fee that the wallet suggests.

C-Cex API does not allow you to withdraw, it doesn't have that option.
you can check it out here: https://c-cex.com/?id=api

i must say what you want is not such a good idea, and it is not safe either. it is best if you use your own wallet and do the withdrawals that way. using an exchange like this to pay your customer can cause a lot of trouble, for example a couple of days ago they had a 30+ hour long maintenance for their bitcoin wallet which means no withdrawal for your customers!
or their site may go down for maintenance, and a lot of other trouble.

if it wasn't verified yet, it won't be for a long time either. there currently are a lot of problems on poloniex and i am sure they are getting at least a thousand tickets per day of pissed off people who lost money, lost their balance, and a lot more problems.
the only thing you can do is wait or move on to another service.

when you are using fiat deposits then you have to "jump through hoops", they do this to protect themselves from getting scammed and also to follow the money laundering laws. if you don't mind giving up your ID then there are a lot of different exchanges that you can use. coinbase, bitstamp, cex.io, kraken are examples.

also there is btc-e that is not so hard on verification, you may want to check them out. although prices are usually a bit lower in there and fiat fees are a bit higher.

as far as i can remember last time they rejected ETF with main reason being "it is not regulated" and also "the price is too volatile" and nothing about these two have changed, bitcoin is not regulated yet and price is still volatile.
so unless there is something more that i don't know, they will reject it once again.

that reminds me i have to move some more funds from my hot wallet to cold storage. i was waiting for the network to become less crowded to do it, but the amount is growing so waiting is getting riskier

there is a question mark beside your account type name, click it and it will redirect you to an article from bittrex on zendesk i think and it is explaining what different types and their restrictions are. they aren't that bad, you can easily work with basic type.

---

i also say please add candlestick to your API. pretty please.

they did that to me a long time ago and i simply moved on to the better exchange called bittrex
and now i am happy, specially these days that Poloniex is screwing their users by fakely being under DDoS and dump on their orders themselves while bittrex is up and functional and fast.

i couldn't withdraw my balance though, but since it was small amount i never bothered to whine about it to support and i simply gave up.

you should always dump whenever you feel like this is the end of the pump and are satisfied with the return you have gotten from the ongoing pump.
what you shouldn't do is wait around and hope for more rise and more profit, that will never end well. you can not possibly know the top so dump when you get enough satisfying profit.

if you liked you can buy back in when price showed signs of more rise but the initial dump must happen if you want profit.

that is not entirely true.
in order to have an effect on what others pay as fee you DO need to pay higher fee or at least a fee on par with others.
the fact that bitcoinfees website shows majority at 101-120 is because many are using old or bad wallet clients that will suggest a fixed default fee of that amount. for example blockchain.info is always going to say 110-120 satoshi per byte.

if the attacker floods the "queue" with low fee transactions they are ALL simply going to be ignored.
for example if there are 100,000 transactions with 100 satoshi per byte fee, i am going to pay a higher fee of 110 s/b and have more priority than them.

in order for a spam attack to be successful and cause higher fees and delays it needs to pay higher fees than what "I" pay. and they do pay higher fees. i have seen from 300 to 600 s/b (there have been 24993 transaction in last 24 hours with 301+ fee)

and it is not just weird unknown entities spamming, it is miners who are filling (wasting) blocks so that they have less space for real transactions.
186704 tx belonging to Bitfury: 3QQB6AWxaga6wTs6Xwq8FYppgrGinGu15f

i don't think it will be big this time. we have already seen the correction, and this time the news about ETF hasn't been the topic at all, nobody was even talking about it. and surely everyone knows the chances of approval is still as small as it was the first time.

all of these are helpful one way or another but in my opinion nothing can beat people wanting to spend their coins. it may sound silly but if people start treating bitcoin as a currency more, and stop just hoarding it, then the "mass adoption" that everyone is just dreaming about will happen.
because merchants won't accept bitcoin as long a there isn't enough demand of it (enough people wanting to spend) and others won't accept it as long as there isn't much usage for it.

taking ransom is something that has been happening ever since Middle Ages and with a lot of different requests, money, property, etc in return.
ransomware has been around for a while (1989) and it also has been asking for many different things. these include but restricted to wire transfers, premium-rate text messages, pre-paid voucher services such as Paysafecard.
ever since 2016 it has started asking for bitcoin also more.

now if you think this can bring down bitcoin, the decentralized cryptocurrency, then you don't know nothing about it

p.s. don't worry they soon will move on to Monero.

for change you just generate a new keypair and use that, or (not recommended) send the change back to the same sending address.
and as for things like wallet or seed, these wallets all have an open source code, which means even if you don't understand it yourself, you can always find someone that does and ask them to solve your problem. for example in case in the future you had an old wallet that the new software didn't recognize. which is unlikely because these wallets are designed in a way to stay "backward-compatible".

the standard (universal) format that you are looking for is private keys. all the wallets understand them without any exception and this will never ever change. and as long as you have the private keys you won't need to worry about wallets changing, disappearing or wanting to use a different type of wallet.

you say "here's your key to use bitcoin, that is all you need. you can use it with any bitcoin client that allows you to import private keys (most of them) and this is like your password"
you can save it in any format you like:
WIF: 5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ
Encrypted (AES encrypted with pass "123"): +NOGmmzM6QQwoU4aX/GIe2KYsBXyWt5qEo36Gn23HCeHAZ4lY9MI4q+S/roUwf6Drd/O4JpA4b+ytzgjzvJo6w==

[above two is the normal way of doing things]

now some more fun ways (since private key is just a big number):
Hex: 0C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
Number: 5500171714335001507730457227127633683517613019341760098818554179534751705629
Binary: 1100001010001111110010100011100001101100011110100010001001110110000000001011001 0111111100101000010110111110010101110000100011110110010000110110100111011111100 0111111011111001000111000110111110100010011000001001111110000110011101011100101 010101000011101

first of all the bitcoin exchanges are new and shitty, so they can get hacked, also them not being regulated means they can pull all kinds of shit and even lie about being hacked and just steal customers money themselves.

secondly don't make assumptions like that, any online platform no matter how secure they are can get hacked.
https://www.helpnetsecurity.com/2016/09/13/gold-bullion-trading-hack/
http://www.estudiodefrances.com/cdrom/option/forex-trade-bot-hack-trade-gold.html
not exactly the same but kind of relevant: https://www.earnforex.com/blog/forex-account-hacking-a-real-problem/


how would you know? have you been around back in around 600 BC? or to be more accurate have you been around 608 BC because by that time Gold was as old as currently bitcoin is and if you want to compare, you should compare that with current bitcoin market not the current huge established for years gold market.

it is true, and it is what you get when you are an early adopter.
and it is always the same, not just for bitcoin for everything. some people see potential, some just get lucky. for example those that invested in some business that went to the moon, like buying Apple shares or other big companies at a super cheap price many years back.
the difference with bitcoin is that it is not yet reached the end where price becomes stable at $X and only moves up and down in $0.1-$1 amounts. we are still rising every year.

well the terminology in bitcoin is a bit tricky in my opinion
when price is fluctuating in a $40 ($20 up and $20 down) range it is considered stable.
when it is going up $100-$200 it is considered a simple rise.
when it drops $100-$200 it is considered a dip or correction, specially if it is after a $600 rise.

but yeah i agree that there is always dump, then panic sells then the avalanche starts and then whales enjoy buying cheap coins in the end!