Trace Block State Diff

Summarize account and storage changes produced by a block.

Use execution state-diff to trace a block and summarize which accounts changed during execution.

The command uses the prestate tracer in diff mode, then aggregates account changes across all traced transactions.

Command

rex execution state-diff \
  --block latest

Limit the printed account table:

rex execution state-diff \
  --block latest \
  --limit 10

Example Output

EXECUTION STATE DIFF

Block:               latest
Trace method:        debug_traceBlockByNumber
Transactions traced: 4
Trace errors:        0
Accounts changed:    9
Balance changes:     3
Nonce changes:       1
Code changes:        0
Storage slots:       12

ADDRESS                                      TXS BALANCE NONCE CODE   STORAGE CREATED DELETED
0x5fbdb2315678afecb367f032d93f642f64180aa3    4 no      no    no          12 no      no
0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266    1 yes     yes   no           0 no      no

How It Works

For block numbers and tags, the command calls:

debug_traceBlockByNumber

For block hashes, it calls:

debug_traceBlockByHash

Both use this tracer configuration:

{
    "tracer": "prestateTracer",
    "tracerConfig": {
        "diffMode": true
    }
}

Field Notes

• TXS is the number of traced transactions that touched the account.
• BALANCE, NONCE, and CODE indicate whether that field changed at least once.
• STORAGE counts unique storage slots changed for the account across the traced block.
• Debug tracing can be expensive on large blocks. Start with recent dev or small local blocks while learning the output.