This is a tough one to crack for me personally, since i have no experience with neither mycelium nor coinjar.
However, since it's a transaction between your own wallets, it *might* be a good idear to just let it be. IF mycelium doesn't rebroadcast unconfirmed transactions, eventually most nodes will drop your unconfirmed transaction from their mempools, and it'll be like the transaction never happened.
Just save the raw, signed transaction in a textfile somewhere just in case the problem doesn't solve itself, so you can re-broadcast the tx.
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
I think coinjar is an online wallet, right? In that case, i think a CPFP will be pretty hard if their wizard is busted... I do think mycelium is a HD wallet, and it gives you a recovery seed. If you succeed in exporting the private keys belonging to KHgsWHPkzfqKKQWbXHMvskDP9uJJNthYk and 1P5z9WUGYLeasq8fKNpMP3FmTpNf1QV9SN, i can make a transaction double spending the inputs of the unconfirmed transaction, and i can show you how you can sign said transaction and broadcast it...
Thanks a lot for your fast reply mocacinno.
I think that unfortunately Mycelium rebroadcasts unconfirmed transactions as I can see you have the manual options to DIY in the interface, and it's been like 8 days (I have read most transactions drop out before 3 days but I may be wrong).
Also I have looked around and it seems there is no way to get the private keys for the input addresses you're mentioning unfortunately, even with the recovery seed... And Coinjar is an Australian exchange for BTC.
Seems like my only hope is to get in touch with a miner directly and get it sorted for a fee. Would you happen to have a preferred contact?