diff --git a/.github/actions/commit-changes/action.yml b/.github/actions/commit-changes/action.yml
new file mode 100644
index 0000000..0d8ac4f
--- /dev/null
+++ b/.github/actions/commit-changes/action.yml
@@ -0,0 +1,67 @@
+name: 'Commit and push if the version file has changed'
+
+inputs:
+  name:
+    description: 'The name of the commiter'
+    required: true
+    default: 'github-actions[bot]'
+  email:
+    description: 'The email of the commiter'
+    required: true
+    default: 'github-actions[bot]@users.noreply.github.com'
+  message:
+    description: 'The commit message'
+    required: true
+    default: 'New release version(s)'
+  files:
+    description: 'The file(s) to add in the commit'
+    required: true
+    default: '*'
+  directory:
+    description: 'The directory in which the action will be performed'
+    required: true
+    default: '.'
+  branch:
+    description: 'Checkout (or create) on a specific branch before commit/push'
+    required: true
+    default: 'master'
+  secret:
+    description: 'A token allowing to push the commit on the repository'
+    required: true
+    default: '.'
+  repository:
+    description: 'The repository where to push'
+    required: true
+    default: ''
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Commit the changes
+      run: |
+        git config --global user.name ${{ inputs.name }}
+        ORIGIN="$(pwd)"
+        cd ${{ inputs.directory }}
+        git switch ${{ inputs.branch }} 2>/dev/null || git switch -c ${{ inputs.branch }}
+        git status
+        CHANGES="$(git status --porcelain ${{ inputs.files }})"
+        if [ -z "${CHANGES}" ]; \
+        then \
+          echo "No changes, stopping now"; \
+          cd ${origin} \
+          exit 0; \
+        fi
+        echo -e "Changes:\n${CHANGES}"
+        git add ${{ inputs.files }}
+        git commit -am "${{ inputs.message }}"
+        git log -n 2
+        cd ${ORIGIN}
+      shell: bash
+
+    - name: Push commit
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ inputs.secret }}
+        branch: ${{ inputs.branch }}
+        directory: ${{ inputs.directory }}
+        repository: ${{ inputs.repository }}
diff --git a/.github/workflows/sdk-generation.yml b/.github/workflows/sdk-generation.yml
new file mode 100644
index 0000000..162371e
--- /dev/null
+++ b/.github/workflows/sdk-generation.yml
@@ -0,0 +1,43 @@
+name: Updating the SDK
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - develop
+
+jobs:
+  updating_SDK:
+    name: Updating the SDK
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clone
+        uses: actions/checkout@v2
+        with:
+          # by default the action uses fetch-depth = 1, which creates
+          # shallow repositories from which we can't push
+          fetch-depth: 0
+          submodules: recursive
+          # needed, else the push inside the action will use default credentials
+          # instead of provided ones
+          persist-credentials: false
+
+      - name: Build new SDK
+        run: python tools/build_sdk.py
+
+      - name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+
+      - name: Commit & push changes in the SDK if any
+        uses: ./.github/actions/commit-changes
+        with:
+          name: 'ldg-github-ci'
+          directory: ethereum-plugin-sdk
+          branch: ${{ steps.extract_branch.outputs.branch }}
+          message: "[update] Branch ${{ steps.extract_branch.outputs.branch }} | Commit ${GITHUB_SHA}"
+          secret: ${{ secrets.CI_BOT_TOKEN }}
+          repository: LedgerHQ/ethereum-plugin-sdk
diff --git a/Makefile b/Makefile
index 0a1a209..0ddf3e8 100644
--- a/Makefile
+++ b/Makefile
@@ -389,7 +389,7 @@ $(shell git submodule update --init)
 endif
 
 # rebuild
-$(shell python3 ethereum-plugin-sdk/build_sdk.py)
+$(shell python3 tools/build_sdk.py)
 $(shell find ./ethereum-plugin-sdk -iname '*.h' -o -iname '*.c' | xargs clang-format-10 -i)
 
 # check if a difference is noticed (fail if it happens in CI build)
diff --git a/tools/build_sdk.py b/tools/build_sdk.py
new file mode 100755
index 0000000..aab3a6e
--- /dev/null
+++ b/tools/build_sdk.py
@@ -0,0 +1,180 @@
+#!/usr/bin/env python3
+
+'''
+This script extract a few specific definitions from app-ethereum that are
+required to exchange information with ethereum external plugins.
+It should always be launched from app-ethereum:
+
+python3 ethereum-plugin-sdk/build_sdk.py
+
+'''
+
+import os
+
+
+def extract_from_headers(sources, nodes_to_extract):
+    cat_sources = []
+    for source in sources:
+        with open(source, 'r') as f:
+            cat_sources += f.readlines()
+
+    sdk_body = []
+    for key, values in nodes_to_extract.items():
+        for value in values:
+            node = []
+            unclosed_curvy_brackets = False
+            unclosed_parantheses = False
+            for line in cat_sources:
+                if key in line and value in line:
+                    node += [line]
+                    unclosed_curvy_brackets = line.count('{') - line.count('}')
+                    if unclosed_curvy_brackets == False:
+                        break
+                elif (key == "fn" and value in line) or unclosed_parantheses:
+                    node += [line]
+                    unclosed_parantheses = line.find(")") == -1
+                    if unclosed_parantheses == False:
+                        break
+                elif unclosed_curvy_brackets:
+                    node += [line]
+                    unclosed_curvy_brackets += line.count(
+                        '{') - line.count('}')
+                    if unclosed_curvy_brackets:
+                        continue
+                    else:
+                        break
+
+            sdk_body += [''.join(node)]
+
+    return '\n'.join(sdk_body)
+
+
+def extract_from_c_files(sources, nodes_to_extract):
+    cat_sources = []
+    for source in sources:
+        with open(source, 'r') as f:
+            cat_sources += f.readlines()
+
+    sdk_body = []
+    for node_name in nodes_to_extract:
+        node = []
+        copying = False
+        wait_curvy_bracket = True
+        for line in cat_sources:
+            if node_name in line:
+                copying = True
+                node += [line]
+                unclosed_curvy_brackets = line.count('{') - line.count('}')
+            elif copying:
+                node += [line]
+                unclosed_curvy_brackets += line.count('{') - line.count('}')
+                if wait_curvy_bracket:
+                    wait_curvy_bracket = line.count('}') == 0
+                if unclosed_curvy_brackets != 0 or wait_curvy_bracket:
+                    continue
+                else:
+                    break
+
+        sdk_body += [''.join(node)]
+
+    return '\n'.join(sdk_body)
+
+
+def merge_headers(sources, nodes_to_extract):
+    includes = [
+        '#include "os.h"',
+        '#include "cx.h"',
+        '#include <stdbool.h>',
+        '#include <string.h>'
+    ]
+
+    body = extract_from_headers(sources, nodes_to_extract)
+
+    eth_internals_h = '\n\n'.join([
+        "/* This file is auto-generated, don't edit it */",
+        "#pragma once",
+        '\n'.join(includes),
+        body
+    ])
+
+    with open("ethereum-plugin-sdk/include/eth_internals.h", 'w') as f:
+        f.write(eth_internals_h)
+
+
+def copy_header(header_to_copy, merged_headers):
+
+    merged_headers = [os.path.basename(path) for path in merged_headers]
+
+    with open(header_to_copy, 'r') as f:
+        source = f.readlines()
+
+    eth_plugin_interface_h = [
+        "/* This file is auto-generated, don't edit it */\n"]
+    for line in source:
+        eth_plugin_interface_h += [line]
+        for header in merged_headers:
+            if header in line:
+                del eth_plugin_interface_h[-1]
+                break
+
+    # add '#include "eth_internals.h"'
+    include_index = eth_plugin_interface_h.index('#include "cx.h"\n')
+    eth_plugin_interface_h.insert(
+        include_index+1, '#include "eth_internals.h"\n')
+
+    # dump to file
+    with open("ethereum-plugin-sdk/include/eth_plugin_interface.h", 'w') as f:
+        f.writelines(eth_plugin_interface_h)
+
+
+def merge_c_files(sources, nodes_to_extract):
+    includes = [
+        '#include "eth_internals.h"'
+    ]
+
+    body = extract_from_c_files(sources, nodes_to_extract)
+
+    eth_internals_h = '\n\n'.join([
+        "/* This file is auto-generated, don't edit it */",
+        '\n'.join(includes),
+        body
+    ])
+
+    with open("ethereum-plugin-sdk/include/eth_internals.c", 'w') as f:
+        f.write(eth_internals_h)
+
+
+if __name__ == "__main__":
+
+    # some nodes will be extracted from these headers and merged into a new one, copied to sdk
+    headers_to_merge = [
+        "src/tokens.h",
+        "src/chainConfig.h",
+        "src/utils.h",
+        "src_common/ethUstream.h",
+        "src_common/ethUtils.h",
+        "src/shared_context.h",
+        "src/eth_plugin_internal.h",
+        "src/nft.h",
+    ]
+    nodes_to_extract = {
+        "#define": ["MAX_TICKER_LEN", "ADDRESS_LENGTH", "INT256_LENGTH", "WEI_TO_ETHER", "SELECTOR_SIZE", "PARAMETER_LENGTH", "RUN_APPLICATION", "COLLECTION_NAME_MAX_LEN"],
+        "typedef enum": [],
+        "typedef struct": ["tokenDefinition_t", "txInt256_t", "txContent_t", "nftInfo_t"],
+        "typedef union": ["extraInfo_t"],
+        "__attribute__((no_instrument_function)) inline": ["int allzeroes"],
+        "const": ["HEXDIGITS"],
+        "fn": ["void getEthAddressStringFromBinary", "void getEthAddressFromKey", "void getEthDisplayableAddress", "bool adjustDecimals", "bool uint256_to_decimal", "void amountToString", "void u64_to_string", "void copy_address", "void copy_parameter"]
+    }
+    merge_headers(headers_to_merge, nodes_to_extract)
+
+    # this header will be stripped from all #include related to previously merged headers, then copied to sdk
+    copy_header("src/eth_plugin_interface.h", headers_to_merge)
+
+    # extract and merge function bodies
+    c_files_to_merge = [
+        "src/utils.c",
+        "src_common/ethUtils.c",
+        "src/eth_plugin_internal.c"
+    ]
+    merge_c_files(c_files_to_merge, nodes_to_extract["fn"])