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I'm building a service prototype by reusing Electrum code and generated 4 consequent transactions which are CPFP type on the testnet. They are staying unconfirmed for several hours but test transaction with 10 sat/vbyte got confirmed in the nex block.

What could be a possible reason for that? Could it be testnet-specific so I should not expect the same behavior on mainnet?

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    Your transactions with less than 1 sat/vbyte won't propagate at all through the network, so nodes won't even see the children that pay for them. – Pieter Wuille Apr 22 at 19:13
  • Get it. I didn't make this mistake with my mainnet test so transactions were confirmed. Thank you very much. – Ilya Evdokimov Apr 23 at 9:06
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The problem you're facing is that even with a high-paying child, the parent needs enough feerate on its own to get relayed on the network.

Staying below 1 sat/vB makes that hard.

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