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Blockchain

The intention of this notebook is to provide a means of testing functionality in the Langchain Document Loader for Blockchain.

Initially this Loader supports:

  • Loading NFTs as Documents from NFT Smart Contracts (ERC721 and ERC1155)
  • Ethereum Mainnnet, Ethereum Testnet, Polygon Mainnet, Polygon Testnet (default is eth-mainnet)
  • Alchemy's getNFTsForCollection API

It can be extended if the community finds value in this loader. Specifically:

  • Additional APIs can be added (e.g. Tranction-related APIs)

This Document Loader Requires:

The output takes the following format:

  • pageContent= Individual NFT
  • metadata={'source': '0x1a92f7381b9f03921564a437210bb9396471050c', 'blockchain': 'eth-mainnet', 'tokenId': '0x15'}

Load NFTs into Document Loader

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

alchemyApiKey="..."

Option 1: Ethereum Mainnet (default BlockchainType)

from langchain_community.document_loaders.blockchainimport(
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]

Option 2: Polygon Mainnet

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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