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The answers to the canonical "my transaction has been pending for too long" question require hundreds of GB of hard drive and bandwidth. I cannot meet such requirements to run a full node.

How can a 15 sat/B, 389 B Segwit unconfirmed transaction to Coinbase be replaced (transaction inputs double-spent?) with a higher transaction fee without downloading the entire blockchain on a full node?

Internet User
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You can use any software which is capable of broadcasting a transaction. This could be another wallet software such as Electrum or a command line tool like bitcoin-submittx.

Andrew Chow
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  • That github page indicates a problem with Segwit. Can it be used to replace an unconfirmed transaction that used Segwit? Should novices use Electrum instead of that command line tool? – Internet User Jan 11 '18 at 01:21
  • Novices should use something else as command line tools are harder for most people to understand and use. – Andrew Chow Jan 11 '18 at 01:33