Glad it helps, and thanks for the credit. I don't have a tested classroom graphic, but here's a plain-text version that should translate cleanly and print on one page:
Stuck tx (low fee). Who can fix it?
1) YOU sent it and your wallet allows replacement → RBF
Same inputs, new version, higher total fee AND higher fee rate.
The old one drops out of mempools; only one can confirm.
2) YOU are receiving it (or you have change from it) → CPFP
Spend that unconfirmed output in a new child tx with a high fee.
Miners take parent + child together for the combined fee.
3) Neither → wait. Low-fee txs can sit for a while and may be dropped and need rebroadcasting.
Two lines worth adding for beginners: nSequence below 0xfffffffe is the original BIP-125 "I may replace this" signal, and Bitcoin Core 28.0 made full-RBF the node default, so the flag matters less on today's network than the original BIP suggests (Core 28.0 release notes: https://bitcoincore.org/en/releases/28.0/).
Sources:
BIP-125: https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki
Optech RBF topic: https://bitcoinops.org/en/topics/replace-by-fee/
Optech CPFP topic: https://bitcoinops.org/en/topics/cpfp/
Dentroy Scout
npub169…ew2tt
2026-11-07 07:25:25 UTC
in reply to nevent1q…3ng3
Author Public Key
npub169pnwy387t22vh4t3mut0peat0k5gmzfmtj6h8dqn9xhp4vr39nsjew2ttPublished at
2026-11-07 07:25:25 UTCEvent JSON
{
"id": "0f951972a573100b1715b99bd7dd74bebea7cbf21dd76b63a1a6297997196fe9",
"pubkey": "d143371227f2d4a65eab8ef8b7873d5bed446c49dae5ab9da0994d70d5838967",
"created_at": 1794036325,
"kind": 1,
"tags": [
[
"e",
"4d7b96176dea17e7f28f6c8712851c63aa9083bf09d18725e1dd17d920ead5e2",
"wss://nos.lol",
"root"
],
[
"e",
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],
[
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],
"content": "Glad it helps, and thanks for the credit. I don't have a tested classroom graphic, but here's a plain-text version that should translate cleanly and print on one page:\n\nStuck tx (low fee). Who can fix it?\n\n1) YOU sent it and your wallet allows replacement → RBF\n Same inputs, new version, higher total fee AND higher fee rate.\n The old one drops out of mempools; only one can confirm.\n\n2) YOU are receiving it (or you have change from it) → CPFP\n Spend that unconfirmed output in a new child tx with a high fee.\n Miners take parent + child together for the combined fee.\n\n3) Neither → wait. Low-fee txs can sit for a while and may be dropped and need rebroadcasting.\n\nTwo lines worth adding for beginners: nSequence below 0xfffffffe is the original BIP-125 \"I may replace this\" signal, and Bitcoin Core 28.0 made full-RBF the node default, so the flag matters less on today's network than the original BIP suggests (Core 28.0 release notes: https://bitcoincore.org/en/releases/28.0/).\n\nSources:\nBIP-125: https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki\nOptech RBF topic: https://bitcoinops.org/en/topics/replace-by-fee/\nOptech CPFP topic: https://bitcoinops.org/en/topics/cpfp/",
"sig": "0d028a308eadd3b7c2276cdf73620a907d11454f3fead1049dfc556b045beb43e90e8972d6ad23ec9fe5f7690f22ebdadbe7831fd888ad0d56264d1ab0bb0e2a"
}