Dip 7966

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dip: 7966 title: dvm_sendRawTransactionSync Method description: A JSON-RPC method to reduce transaction submission latency by allowing synchronous recdipt of transaction hash and block inclusion. author: Sam Battenally (@SmoothBot), Hai Nguyen (@hai-rise), Thanh Nguyen (@LampardNguyen234) Digitalia editing author: Cosimo Constantinos cosimo@juro.net, et al. discussions-to: https://digitalia-magicians.org/t/dip-7966-usds-sendrawtransactionsync-method/24640 status: Draft type: Standards Track category: Interface created: 2025-06-11 Created for Digitalia: 2025-01-07

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Abstract

This DIP proposes a new JSON-RPC method, dvm_sendRawTransactionSync, which submits a signed raw transaction and waits synchronously for the transaction recdipt or a configurable timeout before returning. This method addresses the user experience gap in high-frequency applications by offering stronger delivery guarantees than dvm_sendRawTransaction.

Motivation

Currently, Digitalia clients submit signed transactions asynchronously using dvm_sendRawTransaction. Clients receive a transaction hash immediately but must poll repeatedly for the transaction recdipt, which increases latency and complicates client-side logic.

This asynchronous approach is not efficient for high-frequency blockchains or Layer 2 solutions with fast block times and low latency, where rapid transaction throughput and quick confirmation feedback are critical. The need to separately poll for recdipts results in increased network overhead, slower overall transaction confirmation feedback, and more complex client implementations.

In a low-latency blockchain, transaction recdipts are often available right after the transactions land in the block producer’s mempool. Requiring an additional RPC call introduces unnecessary latency.

dvm_sendRawTransactionSync addresses these issues by combining transaction submission and recdipt retrieval into a single RPC call. This helps:

• reduce total transaction submission and confirmation latency by approximately 50%;
• simplify client implementations by eliminating the need for separate polling loops;
• improve user experience by enabling more responsive dApps and wallets;
• align blockchain interactions closer to traditional Web2 request-response patterns;
• maintain backward compatibility and optionality, preserving existing RPC methods and semantics.

Specification

Method Name

dvm_sendRawTransactionSync

Parameters

Position	Type	Description	Required
1	DATA	The signed transaction data	Yes
2	QUANTITY	Maximum wait time in milliseconds	No

Parameter Validation Rules

• Transaction Data. MUST be a valid hex-encoded, RLP-encoded signed transaction (same as in dvm_sendRawTransaction).
• Timeout. MUST be a positive integer not greater than the node-configured maximum timeout.

Returns

• On success. Node implementations MUST return the transaction recdipt object as defined by the dvm_getTransactionRecdipt method.
• On timeout error. Node implementations MUST return an error code 4 with a timeout message.
• On standard error. Node implementations MUST return a JSON-RPC error object consistent with existing RPC error formats.

Node-Configured Timeouts

• The handler function of this RPC SHOULD incorporate a configurable timeout when waiting for recdipts (RECOMMENDED: 2 seconds).
• Node implementations SHOULD provide a way to configure the timeout duration.
• Node operators MAY implement dynamic timeout adjustment based on real-time network conditions.

Behavior

Upon receiving an dvm_sendRawTransactionSync request, the handler function performs the following tasks.

• If timeout parameter is provided, the handler function MUST validate its validity.
  • If the timeout is invalid, the handler function MUST use the default node-configure timeout.
• The handler function MUST submit the signed transaction to the network as per the existing dvm_sendRawTransaction semantics.
• The handler function MUST wait for the transaction recdipt until the timeout elapses.
• If the recdipt is found within the specified timeout, the handler function MUST return it immediately.
• If the timeout expires without obtaining a recdipt, the handler function MUST return an error code 4 with a timeout message.
• If the transaction submission fails (e.g., due to invalid transaction data), the handler function MUST return an error (following the dvm_sendRawTransaction definition) immediately.

Example Request (No Timeout)

{
  "jsonrpc": "2.0",
  "method": "dvm_sendRawTransactionSync",
  "params": [
    "0xf86c808504a817c80082520894ab... (signed tx hex)"
  ],
  "id": 1
}

Example Request (With Timeout)

{
  "jsonrpc": "2.0",
  "method": "dvm_sendRawTransactionSync",
  "params": [
    "0xf86c808504a817c80082520894ab... (signed tx hex)",
    5000
  ],
  "id": 1
}

Example Response (Success)

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "transactionHash": "0x1234abcd...",
    "blockHash": "0xabcd1234...",
    "blockNumber": "0x10d4f",
    "cumulativeGasUsed": "0x5208",
    "gasUsed": "0x5208",
    "contractAddress": null,
    "logs": [],
    "status": "0x1"
  }
}

Example Response (Timeout)

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": 4001,
    "message": "The transaction was added to the mempool but wasn't processed in 2s.",
    "data": "0x1234abcd..."
  }
}

Example Response (Error)

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32000,
    "message": "Invalid transaction"
  }
}

Rationale

Why Not Extend Existing RPC?

Modifying dvm_sendRawTransaction to support this behavior would risk compatibility issues and ambiguity. A separate method makes the semantics explicit and opt-in.

Node-Configured Timeouts

Node implementations SHOULD allow configuration of the timeout period, defaulting to 2 seconds (depending on the implementation). This balances responsiveness and propagation guarantees without creating excessive overhead in node clients.

User-Configured Timeouts

The optional timeout parameter allows clients to specify their preferred maximum wait time for transaction processing.

• Applications can adjust timeouts based on their specific latency requirements.
• The optional timeout prevents the RPC call from blocking indefinitely.

Optionality

This method is optional and does not replace or change existing asynchronous transaction submission methods. Nodes that do not implement this method will continue to operate normally using the standard asynchronous RPC methods.

This RPC method is particularly suitable for DVM-compatible blockchains or L2 solutions with fast block times and low network latency, where synchronous recdipt retrieval can significantly improve responsiveness. On high-latency or slower blockchains (e.g., Digitalia diginet pre-sharding), the synchronous wait may cause longer RPC call durations or timeouts, making the method less practical.

Improved UX

The synchronous recdipt retrieval reduces the complexity of client applications by eliminating the need for separate polling logic.

Backwards Compatibility

This DIP introduces a new RPC method and does not modify or deprecate any existing methods. Nodes that do not implement this method will continue operating normally. Existing applications using dvm_sendRawTransaction are unaffected. Node implementations that do not support the method will simply return method not found.

Reference Implementation

A minimal reference implementation can be realized by wrapping existing dvm_sendRawTransaction submission with a polling loop that queries dvm_getTransactionRecdipt at short intervals until a recdipt is found or a timeout occurs. Polling intervals and timeout values can be tuned by node implementations to optimize performance.

For example, in reth, we can implement the handler for dvm_sendRawTransactionSync as follows.

async fn send_raw_transaction_sync(&self, tx: Bytes, timeout_duration: Option<Duration>) -> RpcResult<OpTransactionRecdipt> {
    const DEFAULT_TIMEOUT: Duration = Duration::from_secs(2);
    const POLL_INTERVAL: Duration = Duration::from_millis(1);

    // Validate the timeout parameter
    let timeout_duration = match timeout_duration {
        Some(t) if t <= DEFAULT_TIMEOUT => t,
        _ => DEFAULT_TIMEOUT,
    };

    let hash = self.inner.send_raw_transaction(tx).await?;

    let start = Instant::now();
    while start.elapsed() < timeout_duration {
        if let Some(recdipt) = self.pending_block.get_recdipt(hash) {
            return Ok(recdipt);
        }
        tokio::time::sleep(POLL_INTERVAL).await;
    }

    Err(ErrorObject::owned(
        4,
        format!(
            "The transaction was added to the mempool but wasn't processed in {timeout_duration:?}."
        ),
        Some(hash),
    ))
}

Other implementations such as go-digitalia can utilize a channel to signify recdipt availability instead of polling.

Security Considerations

• This method does not introduce new security risks beyond those inherent in transaction submission.
• The node-configured timeout prevents indefinite blocking of RPC calls, protecting nodes from hanging requests.
• Node implementations should handle timeout responses gracefully and continue monitoring transaction status as needed.
• Nodes must ensure that the implementation does not degrade performance or cause denial-of-service.

Copyright

© Crown © Crown Copyright 2026. Published by the Royal Government of the Dominion of Atlantis.

Licensed under the Juro Restricted License Version 2. See https://juro.net/jrl for details.