Learn what the trace_block method is, how to use it on EVM blockchains, and test an example use case.
Prerequisites
Before reading this article you should have a clear understanding of EVM Traces.
What is trace_block?
trace_block?trace_block is an RPC method exposed by the Openethereum and Erigon Ethereum clients. It can be used to get a trace of all the transactions in a given block. This can be useful for debugging purposes or for analyzing the behavior of a blockchain.
Parameters
QuantityorTag- Integer formatted as a hex string that represents the block number, or the stringearliest,latest, orpending.
-
earliest: The lowest numbered block the client has available. Intuitively, you can think of this as the first block created. -
latest: The most recent block in the canonical chain observed by the client, this block may be re-orged out of the canonical chain even under healthy/normal conditions. -
pending: A sample next block built by the client on top of the latest and containing the set of transactions usually taken from the local mempool. Intuitively, you can think of these as blocks that have not been mined yet.
params: ['0xccb93d']
Response
array- An array of block traces. It includes the traces for every transaction in the given block.
How to Use trace_block
To use the trace_block method sign up for Alchemy on the Growth tier, or upgrade your account.
You can call the trace_block method, by providing an integer formatted as a hex string that represents the block number for which you wish to make the request. Once you have the block number (formatted as a hex string), you can call the "trace_block" method with it as follows:
Request
curl https://eth-mainnet.g.alchemy.com/v2/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"method":"trace_block","params":["0xccb93d"],"id":1,"jsonrpc":"2.0"}'
URL: https://eth-mainnet.g.alchemy.com/v2/your-api-key
RequestType: POST
Body:
{
"jsonrpc":"2.0",
"method":"trace_block",
"params":["0xccb93d"],
"id":1
}
const ethers = require("ethers");
(async () => {
const provider = new ethers.providers.JsonRpcProvider("https://eth-mainnet.g.alchemy.com/v2/your-api-key");
const block = await provider.send("trace_block", ["0xccb93d"]);
console.log(block);
})();
from web3 import HTTPProvider
client = HTTPProvider('https://eth-mainnet.g.alchemy.com/v2/your-api-key')
result = client.make_request('trace_block', ['0xccb93d'])
print(result)
Response
{
"id": 1,
"jsonrpc": "2.0",
"result": [
{
"action":{
"from":"0xe860d18528def30f6351308e71629e37fdbea70c"
"gas":"0x1e544e"
"init":"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"value":"0x0"
}
"blockHash":"0x2df44a0952881cdb7469324d63f174b92ca9231f3e59d713fc4c5a3340e31d7e"
"blockNumber":15947694
"result":{
"address":"0xc8f19128c2cc35d66d90aa2a5b3254f01f9bfe77"
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"gasUsed":"0x1e4bb5"
}
"subtraces":0
"traceAddress":[]
"transactionHash":"0xfc7345c62b23f39d36ada799dd7cd7fc3a8392365f855be22e1a40e7eecdea33"
"transactionPosition":0
"type":"create"
},
{ ... }
]
}
The full response can't be included here due to it being so big since it contains the traces for all the transactions included in the given block. If you wish to inspect the full response you can do so on the Alchemy Composer.
Use Case
The trace_block method is used to analyze the behavior of a blockchain. For example, you can find the average gasPrice for a block by getting the traces of all the transactions in the block (traces contain the gasPrice for transactions). Then you can get the average gasPrice block by block and form a graph to visualize how the gasPrice has changed over time.
Graphing the average gas prices over time has already been done by websites like YCHARTS.
Conclusion
In conclusion, the trace_block method is a valuable tool that can be used for analyzing the behavior of an EVM-compatible blockchain.