feat(svm): L-02 Missing SpeedUpV3Deposit and FillV3RelayWithUpdatedDe…

[md0x]

Changes proposed in this PR:

• Fix the following issue identified by OZ:

The speedUpV3Deposit function, implemented in EVM Spoke Pools, allows users to signal updated output amounts, recipient addresses, and messages to the relayer. However, this functionality is not present in the SVM Spoke Pool. Similarly, the fillV3RelayWithUpdatedDeposit function is also absent from the SVM Spoke Pool which is an alternative to the fillV3Relay function for filling deposits. The absence of these two functions creates functional inconsistencies between the EVM and SVM Spoke Pools. As such, this inconsistency could confuse users who expect uniform functionality across platforms and can reduce operational flexibility in managing deposits and relays.

Consider implementing both speedUpV3Deposit and fillV3RelayWithUpdatedDeposit functionalities in the SVM Spoke Pool to align with the EVM Spoke Pools. Alternatively, clearly document their absence to manage user expectations effectively.

We acknowledge this issue but will not implement speed-ups for the following reasons:

Speed-ups are not used often, especially with deposit expirations in place. Previously, they were used to update deposit parameters, but expirations now handle this effectively.

Supporting speed-ups on Solana is overly complex due to incompatible cryptographic schemes. Solana wallets (Ed25519) and Ethereum (ECDSA secp256k1) use different signature algorithms:

While ECDSA signatures from Ethereum wallets can be verified on Solana, Solana wallets cannot generate ECDSA signatures that can be verified on Ethereum.

Speed-ups require the depositor’s signature to be validated on both source and destination chains, which demands a shared signature scheme—something not feasible between Solana and Ethereum.

Given these limitations, we have decided to drop support for speed-ups on Solana.

Added a comment explaining the above.

[linear]

ACX-3582 L-02 Missing `SpeedUpV3Deposit` and `FillV3RelayWithUpdatedDeposit` Functionalities in SVM Spoke Pool