langchain/docs/versioned_docs/version-0.2.x/integrations/document_loaders/blockchain.ipynb

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    "# Blockchain"
   ]
  },
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   "source": [
    "## Overview"
   ]
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    "The intention of this notebook is to provide a means of testing functionality in the Langchain Document Loader for Blockchain.\n",
    "\n",
    "Initially this Loader supports:\n",
    "\n",
    "*   Loading NFTs as Documents from NFT Smart Contracts (ERC721 and ERC1155)\n",
    "*   Ethereum Mainnnet, Ethereum Testnet, Polygon Mainnet, Polygon Testnet (default is eth-mainnet)\n",
    "*   Alchemy's getNFTsForCollection API\n",
    "\n",
    "It can be extended if the community finds value in this loader.  Specifically:\n",
    "\n",
    "*   Additional APIs can be added (e.g. Tranction-related APIs)\n",
    "\n",
    "This Document Loader Requires:\n",
    "\n",
    "*   A free [Alchemy API Key](https://www.alchemy.com/)\n",
    "\n",
    "The output takes the following format:\n",
    "\n",
    "- pageContent= Individual NFT\n",
    "- metadata={'source': '0x1a92f7381b9f03921564a437210bb9396471050c', 'blockchain': 'eth-mainnet', 'tokenId': '0x15'})"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Load NFTs into Document Loader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# get ALCHEMY_API_KEY from https://www.alchemy.com/\n",
    "\n",
    "alchemyApiKey = \"...\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Option 1: Ethereum Mainnet (default BlockchainType)"
   ]
  },
  {
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   "execution_count": null,
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   "source": [
    "from langchain_community.document_loaders.blockchain import (\n",
    "    BlockchainDocumentLoader,\n",
    "    BlockchainType,\n",
    ")\n",
    "\n",
    "contractAddress = \"0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d\"  # Bored Ape Yacht Club contract address\n",
    "\n",
    "blockchainType = BlockchainType.ETH_MAINNET  # default value, optional parameter\n",
    "\n",
    "blockchainLoader = BlockchainDocumentLoader(\n",
    "    contract_address=contractAddress, api_key=alchemyApiKey\n",
    ")\n",
    "\n",
    "nfts = blockchainLoader.load()\n",
    "\n",
    "nfts[:2]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Option 2: Polygon Mainnet"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "contractAddress = (\n",
    "    \"0x448676ffCd0aDf2D85C1f0565e8dde6924A9A7D9\"  # Polygon Mainnet contract address\n",
    ")\n",
    "\n",
    "blockchainType = BlockchainType.POLYGON_MAINNET\n",
    "\n",
    "blockchainLoader = BlockchainDocumentLoader(\n",
    "    contract_address=contractAddress,\n",
    "    blockchainType=blockchainType,\n",
    "    api_key=alchemyApiKey,\n",
    ")\n",
    "\n",
    "nfts = blockchainLoader.load()\n",
    "\n",
    "nfts[:2]"
   ]
  }
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