Ethereum Transaction Retrieval: The “listsinceblock” Parameter Explained
The “listsinceblock” parameter is a fundamental part of the Ethereum blockchain, allowing users to retrieve a list of all transactions in blocks since a given block hash, or all transactions if a block hash is not provided. In this article, we will delve into the details of this parameter and its usage.
What is “listsinceblock”?
“listsinceblock” is an HTTP request that retrieves a list of all transactions in blocks since a given block hash, or all transactions if a block hash is not provided. This parameter is used by web3.py, a popular Python library for interacting with the Ethereum blockchain, to retrieve transactions from the blockchain.
**Arguments: “1. “blockhash” (…
- Block hash
: The first argument is required and specifies the block hash from which to start fetching transactions. You can use this to fetch specific blocks or to fetch all transactions if a block hash is not provided.
target-confirmations
: Optional, the third argument specifies the target number of confirmations for each block before including it in the response. By default,
listsinceblockincludes transactions from blocks with fewer than 4 confirmations.
**Return value: 1.list(...
Thelistsinceblockparameter returns a JSON object containing all transactions since the specified block hash or if no block hash is provided. The response may include metadata such as block number, timestamp, and transaction count.
Usage example:
''bash
curl -X POST \
\
-H "Content-Type: application/json" \
-d '{"key":"value"}'
In this example, replace "YOUR_PROJECT_ID" with your actual Infura project ID. The response from the server would be in JSON format:
json
[
{
"blockNumber": 1,
"timestamp": 1643723400,
"transactionCount": 100,
"transactions": [...]
},
{
"blockNumber": 2,
"timestamp": 1643723410,
"transactionCount": 200,
"transactions": [...]
}
]
“
To sum up, the “listsinceblock” parameter is a powerful tool for retrieving transactions from the Ethereum blockchain. By providing a block hash or a hash of it and specifying target confirmations, you can retrieve all related transactions or specific blocks with fewer than 4 confirmations.
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