Enumerator of the supported blockchains.
Load elements from a blockchain smart contract.
See supported blockchains here: https://python.langchain.com/v0.2/api_reference/community/document_loaders/langchain_community.document_loaders.blockchain.BlockchainType.html
If no BlockchainType is specified, the default is Ethereum mainnet.
The Loader uses the Alchemy API to interact with the blockchain. ALCHEMY_API_KEY environment variable must be set to use this loader.
The API returns 100 NFTs per request and can be paginated using the startToken parameter.
If get_all_tokens is set to True, the loader will get all tokens on the contract. Note that for contracts with a large number of tokens, this may take a long time (e.g. 10k tokens is 100 requests). Default value is false for this reason.
The max_execution_time (sec) can be set to limit the execution time of the loader.
