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Optimism - tx hash 0x0000000000000000000000000000000000000000000000000000000000000000

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With Optimism, when using the method debug_traceBlockByHash you may encounter a problem retrieving the expected transaction hash, where it returns as follows:

  • "txHash": "0x0000000000000000000000000000000000000000000000000000000000000000",

Request example:

curl --location 'https://api.tatum.io/v3/blockchain/node/optimism-mainnet/' \
--header 'Content-Type: application/json' \
--header 'x-api-key: {YOUR_API_KEY}' \
--data '{
    "jsonrpc": "2.0",
    "method": "debug_traceBlockByHash",
    "params": [
        "0xc2e5cad4cf8082512c3053e698997ff2fc9e85511ad011b46fea29cb2f99cb62",
        {
            "tracer": "callTracer",
            "timeout": "90s"
        }
    ],
    "id": 1
}'
//Response:
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
        {
            "txHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
            "result": {
                "from": "0x2bdf9249c350c68a43a9714c1b9153af54751b1c",
                "gas": "0x7302c",
                "gasUsed": "0x1e484",
                "input": "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",
                "output": "0x",
                "time": "94.757804ms",
                "to": "0xa6d25eebae9c841c44ad01c9176556a4c2189961",
                "type": "CALL",
                "value": "0x0"
            }
        }
    ]
}

Root Cause Analysis

Tatum runs op-geth and l2-geth instances on the Optimism network.

  • l2-geth has the legacy (pre-bedrock) data.

When querying pre-Bedrock blocks using the debug_traceBlockByHash method, the response does not include the txHash either through op-geth or directly from l2-geth.

However, transaction hashes can still be retrieved using the following methods and trace:

  • eth_getBlockByNumber
  • eth_getBlockByHash
  • debug_traceTransaction

Additional details

1. debug_traceBlockByHash on op-geth

The following query does not return the txHash for pre-Bedrock blocks:

curl -s -S
--location $OP_GETH
--header 'Content-Type: application/json'
--data '{  
    "jsonrpc": "2.0",  
    "method": "debug_traceBlockByHash",  
    "params": [  
        "0xc2e5cad4cf8082512c3053e698997ff2fc9e85511ad011b46fea29cb2f99cb62",  
        {  
            "tracer": "callTracer",  
            "timeout": "90s"  
        }  
    ],  
    "id": 1  
}' | jq .  
//Response:  
{  
  "jsonrpc": "2.0",  
  "id": 1,  
  "result": [  
    {  
      "txHash": "0x0000000000000000000000000000000000000000000000000000000000000000",  
      "result": {  
        "from": "0x2bdf9249c350c68a43a9714c1b9153af54751b1c",  
        "gas": "0x7302c",  
        "gasUsed": "0x1e484",  
        "input": "...",  
        "output": "0x",  
        "time": "125.850629ms",  
        "to": "0xa6d25eebae9c841c44ad01c9176556a4c2189961",  
        "type": "CALL",  
        "value": "0x0"  
      }  
    }  
  ]  
}

2. debug_traceBlockByHash on l2-geth

Querying directly on l2-geth also returns the trace without the txHash:

curl -s -S
--location $L2_GETH
--header 'Content-Type: application/json'
--data '{  
    "jsonrpc": "2.0",  
    "method": "debug_traceBlockByHash",  
    "params": [  
        "0xc2e5cad4cf8082512c3053e698997ff2fc9e85511ad011b46fea29cb2f99cb62",  
        {  
            "tracer": "callTracer",  
            "timeout": "90s"  
        }  
    ],  
    "id": 1  
}' | jq .  
//Response:  
{  
  "jsonrpc": "2.0",  
  "id": 1,  
  "result": [  
    {  
      "result": {  
        "type": "CALL",  
        "from": "0x2bdf9249c350c68a43a9714c1b9153af54751b1c",  
        "to": "0xa6d25eebae9c841c44ad01c9176556a4c2189961",  
        "value": "0x0",  
        "gas": "0x7302c",  
        "gasUsed": "0x1e484",  
        "input": "...",  
        "output": "0x",  
        "time": "126.806103ms"  
      }  
    }  
  ]  
}

3. eth_getBlockByNumber to Retrieve Transaction Hash

The transaction hash can be retrieved using:

 curl -s -S 
  --location $OP_GETH 
  --header 'Content-Type: application/json'
  --data '{  
       "jsonrpc": "2.0",  
       "method": "eth_getBlockByNumber",  
       "params": [  
           "0x4EAF17",  
           true  
       ],  
       "id": 1  
   }' | jq '.result.transactions[0].hash'
//Response:
"0x84a9762c0fa0abe2bbaf3e9b6917c2338f13f36bf806b0d99ebaa90e1c4c3f14"

4. Handling the retrieval of traces for pre-Bedrock blocks

You may use something like the following script; to first get the transaction hashes and then trace each transaction individually:

#!/bin/zsh

# Environment variable for API key
API_KEY=$YOUR_KEY

# Function to get block details by hash
get_block_details() {
  local block_hash=$1
  curl --silent --location "https://api.tatum.io/v3/blockchain/node/optimism-mainnet" \
    --header "x-api-key: $API_KEY" \
    --header "Content-Type: application/json" 
    --data "{
    \"jsonrpc\": \"2.0\",
    \"method\": \"eth_getBlockByHash\",
    \"params\": [\"$block_hash\", true],
    \"id\": 1
  }" | jq -r '.result.transactions[].hash'
}

# Function to trace transaction by hash
trace_transaction() {
  local tx_hash=$1
  curl --silent --location "https://api.tatum.io/v3/blockchain/node/optimism-mainnet" \
    --header "x-api-key: $API_KEY" \
    --header "Content-Type: application/json" --data "{
    \"jsonrpc\": \"2.0\",
    \"method\": \"debug_traceTransaction\",
    \"params\": [\"$tx_hash\", {\"tracer\": \"callTracer\", \"timeout\": \"90s\"}],
    \"id\": 1
  }" | jq .
}

# Block hash to query
block_hash="0xc2e5cad4cf8082512c3053e698997ff2fc9e85511ad011b46fea29cb2f99cb62"

# Get transaction hashes from the block
tx_hashes=$(get_block_details $block_hash)

# Trace each transaction
for tx_hash in $tx_hashes; do
  echo "Tracing transaction: $tx_hash"
  trace_transaction $tx_hash
done

Updated 6 months ago