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bolt-09: reserve feature bits for option_anchors_zero_fee_htlc_tx (#828)
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.aspell.en.pws

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lexicographically
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MINIMALIF
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SIGHASH
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sighash
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ANYONECANPAY
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cpfp
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utxo

09-features.md

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| 16/17 | `basic_mpp` | Node can receive basic multi-part payments | IN9 | `payment_secret` | [BOLT #4][bolt04-mpp] |
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| 18/19 | `option_support_large_channel` | Can create large channels | IN | | [BOLT #2](02-peer-protocol.md#the-open_channel-message) |
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| 20/21 | `option_anchor_outputs` | Anchor outputs | IN | `option_static_remotekey` | [BOLT #3](03-transactions.md) |
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| 22/23 | `option_anchors_zero_fee_htlc_tx` | Anchor commitment type with zero fee HTLC transactions | IN | | [BOLT #3][bolt03-htlc-tx], [lightning-dev][ml-sighash-single-harmful]|
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## Requirements
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[bolt02-retransmit]: 02-peer-protocol.md#message-retransmission
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[bolt02-open]: 02-peer-protocol.md#the-open_channel-message
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[bolt03-htlc-tx]: 03-transactions.md#htlc-timeout-and-htlc-success-transactions
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[bolt04]: 04-onion-routing.md
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[bolt07-sync]: 07-routing-gossip.md#initial-sync
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[bolt07-query]: 07-routing-gossip.md#query-messages
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[bolt04-mpp]: 04-onion-routing.md#basic-multi-part-payments
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[ml-sighash-single-harmful]: https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-September/002796.html

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