Customizable Message Transmission Options

UIP allows users to tailor message transmission settings to meet specific application requirements, balancing priorities like speed and security. These options are encoded and stored in the encoded parameter option, enabling agents to execute transactions in line with user-defined preferences.

Propose Function

This function emits an event from the smart contract, which is picked up by our agents. The agents decode the event to extract details such as the destination chain, the message content, the block finalization option, any custom gas limits, and other relevant information. Once decoded, the message is transmitted to our EIB chain for further processing.

function propose(
    uint256 destChainID,
    bytes32 selectorSlot,
    bytes calldata encodedParams,
    bytes calldata destAddress,
    bytes calldata payload
) external payable {
    _propose(
        _msgSender(), 
        destChainID, 
        selectorSlot, 
        agentParams, 
        destAddress, 
        payload
    );
}

Solidity Example Code

function sendMessage(
        uint256 chainID,
        uint256 blockFinalizationOption,
        uint256 customGasLimit,
        bytes calldata destAddress,
        string calldata _msg
    ) external payable {
        TransmitterParamsLib.TransmitterParams memory transmitterParams = TransmitterParamsLib.TransmitterParams(
            blockFinalizationOption,
            customGasLimit
        );
        bytes memory encodedParams = abi.encodePacked(transmitterParams.blockFinalizationOption, transmitterParams.customGasLimit);
        
        IEndpoint(endpoint).propose{value: msg.value}(
            chainID,
            SelectorLib.encodeDefaultSelector(
                DEFAULT_SELECTOR
            ),
            encodedParams,
            destAddress,
            abi.encode(abi.encode(_msg), abi.encode(_msgSender()))
        );
    }

Solana Example Code

We're currently working on Solana integration as part of our next milestone. We have prepared guides for teams and developers interestered in early access. To learn more or request access, visit our contact page.

Parameter Definitions

Parameter	Description
destChainID	The identifier of the destination chain.
selectorSlot	A default selector for the execute function in the endpoint contract (this value should remain unchanged).
encodedParams	Encoded parameters such as blockFinalizationOption and customGasLimit inbyte format (details on creating these parameters are provided below).
destAddress	The address of the recipient on the destination chain.
payload	The payload is any data which should be carried to the destination chain. Use abi.encode(...) to convert your data into "bytes" format.

Encoded Parameter Option Definitions

The transmission options are stored in a struct called the TransmitterParams. For up-to-date parameter definitions please refer to the latest implementation of the TransmitterParamsLib.

struct TransmitterParams {
    uint256 blockFinalizationOption;
    uint256 customGasLimit;
}

The transmission options descriped below are then encoded into bytes and stored in the encodedParams parameter of the propse function.

Option	Description
blockFinalizationOption	Defines the number of blocks to wait before retrieving message events from the source chain and execution events from the destination chain.
customGasLimit	Specifies the gaslimit for transaction execution on destination chain.

Encoding Parameters

To encode these parameters into bytes, use the abi.encodePacked() function and pass in the TransmitterParams options one by one, as shown in the example below.

bytes memory encodedParams = abi.encodePacked(transmitterParams.blockFinalizationOption, transmitterParams.customGasLimit);

Block Finalization

UIP gives full control to developers. One such way is via the block finalization option which allows you to fine tune the block wait time. By default the standard type is recommended and used. However, if you wish to use another option, we provide extra details and use cases for each finalization type.

Block Finalization Option Descriptions

Warning: Use the "Unsafe" option with EXTREME CAUTION. By selecting it, you explicitly acknowledge and accept the risk that the transaction or event might be reverted due to a block reorg. This could lead to data inconsistency or financial loss.

Finalization Type	Description
Standard	The default and safest option. It adheres to the full finalization process defined by the source network. This ensures the highest or close to the highest level of security and immutability.
Fast	Prioritizes speed while maintaining a reasonable level of safety. It uses a reduced finalization process that is less strict than Standard Finalization but still guarantees secure delivery.
Unsafe	The fastest option, but it bypasses standard finalization processes. This dramatically reduces confirmation time but introduces the risk of block restructuring (reorgs).

Block Finalization Option Behaviour Explanations

Finalization Type	Behaviour
Standard	Confirmation occurs only after the standard block finalization period (or block depth) specified by the source network has elapsed.
Fast	Confirmation occurs after a minimal finalization process, ensuring the block sequence is unlikely to be reverted.
Unsafe	Confirmation is immediate or near-immediate, based on minimal criteria. There's no guarantee that the confirmed transaction will be permanent.

Block Finalization Option Use Cases

Finalization Type	Use Case
Standard	Recommended for applications handling high-value transactions or where data integrity is paramount.
Fast	Suitable for most applications.
Unsafe	Only recommended for experimental purposes, low-value transactions where the risk of reorg is acceptable, or in specific scenarios where immediate confirmation is more critical than data integrity (e.g., certain types of data feeds where eventual consistency is sufficient). Thoroughly understand the implications before using this option.

Recommended Values for Block Finalization

Below is a list of recommended values for block finalization for different networks and finalization types.

Network	Standard	Fast	Unsafe
Base	195	30	1
Entangle	1	1	1
Ethereum	32	12	1
Mantle	195	30	1
Avalanche	5	2	1
Sonic	20	10	1
Polygon	100	50	1
Solana	32	16	2
Berachain	5	2	1
Binance	40	5	1
Arbitrum	1500	240	5
Abstract	900	20	1
Manta	40	5	1
Immutable	195	20	1
Optimism	195	30	1