t3rn | Turn your blockchain into a multichain hub.

▶ What is t3rn

Whitepaper

What is t3rn?

INTEROPERABLE

EASY TO USE

SCALABLE

t3rn creates frictionless multichain smart contract execution, that's accountable, scalable, and completely trust-free for investors, users, and developers.

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Interoperability for platforms

t3rn intelligently supports the interoperable systems that the multichain future will be built on by working intellligently with any cross-chain transaction.

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Reversibility for users

t3rn smart contract hubs have built-in fail safes that reverse failed transactions to their last secure point, ensuring that funds arent't lost.

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Composability for developers

Open-source code depolyed with full on-chain provenance, allowing original authors to get paid every time their code executes.

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Use Cases

How it works

See docs

Limitless Defi

Defi should never be limited to one blockchain, t3rn makes multichain defi not only possible, but highly secure too.

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On-chain Smart Contract Repository

Anyone can use the smart contracts stored in our open-source registry or get paid whenever a smart contract you upload is used.

Smart contracts can be uploaded as they are, in familiar languages like Solidity, ink!, WebAssembly or anything that compiles to WASM.

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Setting cross-chain standards (XBI)

The Web3 Foundation commissioned t3rn to build XBI, an easy-to-use standard for cross-chain messaging.

Learn more

Copied


#RegisterSmartContract {
  onEscrowTransferReceived(|user, btc_swap_amount|) => Result<StepState, Error> 
  {
     let price = 3rdPartyOracle::get_price("BTC/ETH");
     let btc = price * btc_swap_amount;
     let eth = Interlay::escrow_swap("BTC/ETH", btc, self.owner);
     let gno = Ethereum::uniswap::swap("ETH/GNO", eth, self.owner);
     Gnosis::transfer(mark, user, gno)
     Ok(())
  };
};

Copied


#[ink::contract]
mod get_best_price_from_oracles {
    use t3rn_sdk::{
        Chain::{Ethereum, Polygon, Gnosis},
        GlobalTypes::{Balance},
        Operation::{AddLiquidity, Assets, CallEvm, CallWasm, Swap, Transfer},
   };

    #[ink(storage)]
    pub struct MyPriceSearchContract {}

    impl MyPriceSearchContract {
        #[ink(message, payable)]
        pub fn on_transfer_received(&mut self, state: Option<State>, eth: Balance) {
            let usdc_price_ethereum = Ethereum::uniswap::get_price("BTC/USDC");
            let usdc_price_polygon = Polygon::uniswap::get_price("BTC/USDC");
            let usdc_price_gnosis = Gnosis::uniswap::get_price("BTC/USDC");

            if usdc_price_ethereum < usdc_price_polygon && usdc_price_ethereum < usdc_price_gnosis {
                let usdc = Ethereum::uniswap::swap("ETH/USDC", eth, self.owner);
                Ethereum::transfer(self.owner, usdc);
            } else if usdc_price_gnosis < usdc_price_polygon && usdc_price_gnosis < usdc_price_ethereum {
                let usdc = Gnosis::uniswap::swap("ETH/USDC", eth, self.owner);
                Gnosis::transfer(self.owner, usdc);
            } else {
                let usdc = Polygon::uniswap::swap("ETH/USDC", eth, self.owner);
                Polygon::transfer(self.owner, usdc);
            }
       }
    }
}

Copied


let para_id = 2001;
let uniswap_clone_addr = hex_literal::hex!("4f6a1caa01161180582092ecfac2502b").into();
let call = Call:Evm {
  caller: callee,
  dest: uniswap_clone_addr,
  value,
  input: ["swap", "DOT", "TRN", self.callee],
  gas_limit,
  ..Default::default()
};

let asset_id = XDOT::get_id();
let xbi_call = XBI::new()
  .with_call(para_id, call)
  .with_timeout_blocks(50)
  .with_max_execution_cost(10_000_000_000)
  .with_execution_asset(asset_id)
  .build();

let asset_id: u32 = 0;
let xbi_call = XBI::new()
   .with_withdraw_asset(Some(asset_id), 1_000_000_000_000)
   .with_buy_execution(Some(asset_id), 1_000_000_000_000)
   .with_transact(
       Some(1_000_000_000),
       init_open_channel_req(parachain, None, None, Some(relaychain_meta)),
   )
   .with_refund_surplus()
   .with_deposit_asset(Some(asset_id), 1, id_shadow)
   .build();

Use Cases

How it works

See docs

Copied


#RegisterSmartContract {
  onEscrowTransferReceived(|user, btc_swap_amount|) => Result<StepState, Error> {
     let price = 3rdPartyOracle::get_price("BTC/ETH");
     let btc = price * btc_swap_amount;
     let eth = Interlay::escrow_swap("BTC/ETH", btc, self.owner);
     let gno = Ethereum::uniswap::swap("ETH/GNO", eth, self.owner);
     Gnosis::transfer(mark, user, gno)
     Ok(())
  };
};

Limitless Defi

Defi should never be limited to one blockchain, t3rn makes multichain defi possible.

Learn more

Copied


#[ink::contract]
mod get_best_price_from_oracles {
    use t3rn_sdk::{
        Chain::{Ethereum, Polygon, Gnosis},
        GlobalTypes::{Balance},
        Operation::{AddLiquidity, Assets, CallEvm, CallWasm, Swap, Transfer},
   };

    #[ink(storage)]
    pub struct MyPriceSearchContract {}

    impl MyPriceSearchContract {
        #[ink(message, payable)]
        pub fn on_transfer_received(&mut self, state: Option<State>, eth: Balance) {
            let usdc_price_ethereum = Ethereum::uniswap::get_price("BTC/USDC");
            let usdc_price_polygon = Polygon::uniswap::get_price("BTC/USDC");
            let usdc_price_gnosis = Gnosis::uniswap::get_price("BTC/USDC");

            if usdc_price_ethereum < usdc_price_polygon && usdc_price_ethereum < usdc_price_gnosis {
                let usdc = Ethereum::uniswap::swap("ETH/USDC", eth, self.owner);
                Ethereum::transfer(self.owner, usdc);
            } else if usdc_price_gnosis < usdc_price_polygon && usdc_price_gnosis < usdc_price_ethereum {
                let usdc = Gnosis::uniswap::swap("ETH/USDC", eth, self.owner);
                Gnosis::transfer(self.owner, usdc);
            } else {
                let usdc = Polygon::uniswap::swap("ETH/USDC", eth, self.owner);
                Polygon::transfer(self.owner, usdc);
            }
       }
    }
}

On-chain Smart Contract Repository

Anyone can use the smart contracts stored in our open-source registry or get paid whenever a smart contract you upload is used.

Learn more

Copied


let para_id = 2001;
let uniswap_clone_addr = hex_literal::hex!("4f6a1caa01161180582092ecfac2502b").into();
let call = Call:Evm {
  caller: callee,
  dest: uniswap_clone_addr,
  value,
  input: ["swap", "DOT", "TRN", self.callee],
  gas_limit,
  ..Default::default()
};

let asset_id = XDOT::get_id();
let xbi_call = XBI::new()
  .with_call(para_id, call)
  .with_timeout_blocks(50)
  .with_max_execution_cost(10_000_000_000)
  .with_execution_asset(asset_id)
  .build();

let asset_id: u32 = 0;
let xbi_call = XBI::new()
   .with_withdraw_asset(Some(asset_id), 1_000_000_000_000)
   .with_buy_execution(Some(asset_id), 1_000_000_000_000)
   .with_transact(
       Some(1_000_000_000),
       init_open_channel_req(parachain, None, None, Some(relaychain_meta)),
   )
   .with_refund_surplus()
   .with_deposit_asset(Some(asset_id), 1, id_shadow)
   .build();

Setting cross-chain standards (XBI)

The Web3 Foundation commissioned t3rn to build XBI, an easy-to-use standard for cross-chain messaging.

Learn more


#RegisterSmartContract {
  onEscrowTransferReceived(|user, btc_swap_amount|) 
    => Result<StepState, Error> {
     let price = 3rdPartyOracle::get_price("BTC/ETH");
     let btc = price * btc_swap_amount;
     let eth = Interlay::escrow_swap("BTC/ETH", btc, self.owner);
     let gno = Ethereum::uniswap::swap("ETH/GNO", eth, self.owner);
     Gnosis::transfer(mark, user, gno)
     Ok(())
  };
};