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Merge pull request #49 from bitcoin-dev-project/transaction-module
Transaction module
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‎.github/workflows/repository-dispatch-to-dependent-repos.yml

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name: Send dispatch to dependent repos
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on:
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# Runs on pushes targeting the default branch
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push:
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branches: ["main"]
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# Runs on pushes targeting the default branch
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push:
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branches: ["main"]
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# Allows you to run this workflow manually from the Actions tab
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workflow_dispatch:
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# Allows you to run this workflow manually from the Actions tab
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workflow_dispatch:
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jobs:
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# Build job
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dispatch:
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runs-on: ubuntu-latest
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steps:
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- name: Dispatch to bitcoin-dev-project
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run: |
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curl -X POST \
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-H "Authorization: token ${{ secrets.DISPATCH_UPDATE_BDP }}" \
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-H "Accept: application/vnd.github+json" \
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https://api.github.com/repos/bitcoin-dev-project/bitcoin-dev-project/dispatches \
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-d '{"event_type": "update_submodules"}'
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# Build job
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dispatch:
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runs-on: ubuntu-latest
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steps:
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- name: Dispatch to bitcoin-dev-project
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run: |
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curl -X POST \
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-H "Authorization: token ${{ secrets.DISPATCH_UPDATE_BDP }}" \
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-H "Accept: application/vnd.github+json" \
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https://api.github.com/repos/bitcoin-dev-project/bitcoin-dev-project/dispatches \
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-d '{"event_type": "update_submodules"}'

‎decoding/bitcoin-history.mdx

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date: 2024-07-05T15:32:14Z
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lastmod: "2024-07-06"
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draft: false
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category: History
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category: Introduction
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layout: TopicLayout
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icon: "FaHistory"
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order: 2

‎decoding/fee-calculation.mdx

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---
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title: "Fee Calculation"
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date: 2024-01-25T15:32:14Z
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lastmod: "2024-07-26"
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draft: false
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category: Transactions
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layout: TopicBanner
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order: 6
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icon: "FaClipboardList"
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images: ["/bitcoin-topics/static/images/topics/thumbnails/musig-thumbnail.webp"]
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children: ["weight-vsize", "fee-rate", "rbf"]
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---
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(coming soon)

‎decoding/fee-rate.mdx

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---
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title: "Fee Rate"
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date: 2024-01-25T15:32:14Z
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lastmod: "2024-07-26"
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draft: false
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category: Transactions
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layout: TopicBanner
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order: 2
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icon: "FaClipboardList"
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images: ["/bitcoin-topics/static/images/topics/thumbnails/musig-thumbnail.webp"]
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parent: "fee-calculation"
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---
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(coming soon)

‎decoding/implement-OP_ADD-OP_HASH160.mdx

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"/bitcoin-topics/static/images/topics/thumbnails/project-stack-thumbnail.webp"
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topicType: exercise
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parent: project
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---
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‎decoding/implement-OP_CHECKSIG.mdx

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‎decoding/implement-basic-stack.mdx

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‎decoding/inputs.mdx

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---
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title: "Inputs"
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date: 2024-01-25T15:32:14Z
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lastmod: "2024-07-26"
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draft: false
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category: Transactions
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layout: TopicBanner
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order: 3.3
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icon: "FaClipboardList"
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images: ["/bitcoin-topics/static/images/topics/thumbnails/musig-thumbnail.webp"]
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parent: "transaction-structure"
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---
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(coming soon)

‎decoding/locktime.mdx

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---
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title: "Locktime"
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date: 2024-01-25T15:32:14Z
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lastmod: "2024-07-26"
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draft: false
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category: Transactions
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layout: TopicBanner
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order: 3.5
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icon: "FaClipboardList"
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images: ["/bitcoin-topics/static/images/topics/thumbnails/musig-thumbnail.webp"]
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parent: "transaction-structure"
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---
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(coming soon)

‎decoding/marker-flag.mdx

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---
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title: "Marker and Flag"
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date: 2024-01-25T15:32:14Z
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lastmod: "2024-07-26"
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draft: false
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category: Transactions
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layout: TopicBanner
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order: 3.2
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icon: "FaClipboardList"
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images:
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[
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"/bitcoin-topics/static/images/topics/thumbnails/transaction-module/tx-marker-flag.webp"
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]
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parent: "transaction-structure"
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---
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<TransactionCreation enabledFields={["marker", "flag"]} />
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The marker and flag are optional fields introduced with **SegWit**.
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They indicate that a transaction uses the segregated witness structure defined in **BIP144**.
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Witness data is required for inputs locked by **P2WPKH**, **P2WSH**, or **P2TR**.
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## Marker
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Marker indicates that the transaction uses the extended format.
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- Marker is **1 byte**.
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- Must always be `0x00` to signal a SegWit transaction.
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## Flag
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- The flag is **1 byte**.
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- It is currently set to `0x01` in all SegWit transactions.
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- Future upgrades may use different flags.
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<ExpandableAlert
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title="Note: Legacy Compatibility"
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type="info"
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expandable={false}
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>
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If a transaction doesn’t include witness data, marker and flag are omitted.
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</ExpandableAlert>
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### Question
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How do old nodes treat marker and flag for SegWit transactions?
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<a
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href="https://chat.bitcoinsearch.xyz/?author=holocat&question=How%2520do%2520old%2520nodes%2520treat%2520marker%2520and%2520flag%2520for%2520SegWit%2520transactions%253F"
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target="_blank"
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>
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Answer here
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</a>

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