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本笔记本旨在测试 LangChain 区块链文档加载器的功能。 该加载器目前支持：
  • 从 NFT 智能合约（ERC721 和 ERC1155）加载 NFT 为文档
  • 以太坊主网、以太坊测试网、Polygon 主网、Polygon 测试网（默认为 eth-mainnet）
  • Alchemy 的 getNFTsForCollection API
如果社区认为有价值，可以进一步扩展此加载器，例如：
  • 可以添加更多 API（例如与交易相关的 API）
此文档加载器需要： 输出格式如下：
  • pageContent= 单个 NFT
  • metadata={‘source’: ‘0x1a92f7381b9f03921564a437210bb9396471050c’, ‘blockchain’: ‘eth-mainnet’, ‘tokenId’: ‘0x15’}

​
将 NFT 加载到文档加载器

# get ALCHEMY_API_KEY from https://www.alchemy.com/

alchemyApiKey = "..."

​
选项 1：以太坊主网（默认 BlockchainType）

from langchain_community.document_loaders.blockchain import (
    BlockchainDocumentLoader,
    BlockchainType,
)

contractAddress = "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"  # Bored Ape Yacht Club contract address

blockchainType = BlockchainType.ETH_MAINNET  # default value, optional parameter

blockchainLoader = BlockchainDocumentLoader(
    contract_address=contractAddress, api_key=alchemyApiKey
)

nfts = blockchainLoader.load()

nfts[:2]

​
选项 2：Polygon 主网

contractAddress = (
    "0x448676ffCd0aDf2D85C1f0565e8dde6924A9A7D9"  # Polygon Mainnet contract address
)

blockchainType = BlockchainType.POLYGON_MAINNET

blockchainLoader = BlockchainDocumentLoader(
    contract_address=contractAddress,
    blockchainType=blockchainType,
    api_key=alchemyApiKey,
)

nfts = blockchainLoader.load()

nfts[:2]
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