TON Trustless Bridge Challenge

Repository: github.com/tonred/ton-trustless-bridge

Some method signatures have been slightly modified to allow for more convenient interactions between contracts.

For example:

• The check_transaction method does not include a query_id.
• When calling methods, there is no way to pass callback data (e.g. the recipient of the verification result) without saving it in the contract.

See bridge.tlb for the data structures and method signatures.

Deployed contracts

Testnet:

• LiteClient: EQAkoSjJre8IppSBXcaQfXZpOdBPGN2CdcKebq4gsVMb33il
• TransactionChecker: EQBc-KmVHKA5Glo6tm-nRYtqVUuB4o6cNU5DR4Qv36YV249J

Fastnet:

• LiteClient: Ef-JQBay-l4MvYA-9rH9rM_RgRhVW_sJAPtZy1wD41tfxGdd
• TransactionChecker: Ef_LluiK9bUX7sUyZAatMjQKrWw01JA-F236cibbv_CQKMui

Example of transactions

Fastnet->Testnet

Valid

• new_key_block: 5368e2128a51f2af4dc37b40dfdf353d508d005c34b914069e9d3d35a56b0c11
• check_block: d210046721f24f12b836495453c4ed5bd976864c4f1eefa6c649bbc6d57dd52e
• check_transaction: 1b926ecb66cd721588ea368955fe5b80508982260110f386b3df4de213dd3350

Fake

• check_block: ef77060cff25edf0a4a4a15ba145b11323fcd5cef28eead6156d32606c022f81 - modified block
• check_transaction: 44c2ec4c5f176984632903b0511887693cf31d21a8e8fdd2ccc37fa27816321c - non exists txt

Testnet->Fastnet

• new_key_block: TBD
• check_block: TBD
• check_transaction: TBD

Contracts

LiteClient

(Details to be added.)

TransactionChecker

This contract interacts with the LiteClient in the traditional way using messages.

TransactionCheckerContactless

This contract does not send any messages to the LiteClient. Instead, it verifies the proof of the LiteClient's state and checks the signature itself. This approach enables the construction of a bridge with very high bandwidth. In a single transaction, you can verify the validity of a transaction on another network—where traditionally at least three transactions would be required.

Furthermore, the same method for proving account state can be used in the bridge. This allows you to prove not only transactions but also account states, and it will work for both the masterchain and any shardchain.

NOTE: This contract is not ready yet. It is almost complete, but it has not been tested properly on the network.

Scripts and flow

Config

Before running scripts update config.ts as needed

Deploy Contracts

npm run deploy

Sync new key blocks

npm run sync

Check transactions

npm run broadcast

Run tests

npm run test

Build

npm run build