Blast batches users' transactions and submits them to Ethereum, paying a share of the transaction fees to Ethereum validators (expense). Bridge depositors deposit ETH or stablecoins to Blast and receive a yield from ETH staking or T-bill strategies.

Blast is an L2 smart contract platform for decentralized applications on Ethereum. Blast has an inherent yield generation mechanism, coming from ETH staking and RWA protocols. Blast was founded by Pacman and launched in 2023.

Blast team and investors currently own and govern the protocol. Blast's investors include Paradigm, Standard Crypto, Santiago, etc.

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Blast

# Blast Bridge deposits Methodology

## 1. Overview

Bridge deposits for Blast measures the total USD value of assets deposited into Blast's bridge infrastructure, tracking funds held in bridge contracts plus DAI deposits into the DAI Savings Rate (DSR) system. This metric quantifies capital flowing from Ethereum to the Blast L2 ecosystem and represents the total value locked in Blast's bridging mechanisms.

## 2. Data sources

- **Ethereum transaction traces**: Parsed function calls to Blast's LaunchBridge `stakeUSD` function
- **Token balance snapshots**: Current token holdings across four specific Ethereum bridge contract addresses
- **End-of-day token price feeds**: USD conversion rates for all tracked tokens
- **Token metadata**: Decimal precision and contract information for accurate amount calculations

## 3. Step-by-step calculation

### Component A: Portfolio balances
- **Purpose**: Tracks token balances held in Blast's Ethereum bridge contracts
- **Logic**: Monitors current token balances across four specific Ethereum addresses: `0x5f6ae08b8aeb7078cf2f96afb089d7c9f51da47d`, `0x98078db053902644191f93988341e31289e1c8fe`, `0x697402166fbf2f22e970df8a6486ef171dbfc524`, and `0xa230285d5683c74935ad14c446e137c8c8828438`. These addresses represent Blast's bridge contracts holding deposited assets. Token balances are tracked daily and converted to USD using end-of-day price feeds.
- **Key fields**: Daily `balance` amounts for each token, `timestamp` for daily snapshots, and `chain` identifier set to Ethereum

### Component B: DAI staking deposits
- **Purpose**: Tracks DAI deposits made through Blast's LaunchBridge into the DSR system
- **Logic**: Extracts successful calls to the LaunchBridge `stakeUSD` function on Ethereum, filtering for transactions with `status` equal to true. Raw `amount` values are converted from wei to DAI units by dividing by 10^18. Daily amounts are summed and converted to USD using end-of-day DAI prices. Missing days are filled with zero values, and cumulative sums are calculated to track net DAI deposits over time.
- **Key fields**: Daily `amount` of DAI staked, `block_timestamp` for transaction timing, and `token_address` pointing to the DAI contract (`0x6b175474e89094c44da98b954eedeac495271d0f`)

### Final aggregation
- **Combining components**: Portfolio balances and cumulative DAI staking amounts are combined using union operation, with both components contributing to total bridge deposits
- **Currency conversion**: All amounts are converted to USD using end-of-day token price feeds at the time of each measurement
- **Time aggregation**: Data is aggregated to daily granularity with timestamp boundaries set at day level
- **Final calculation**: The sum of USD-denominated portfolio balances plus cumulative DAI staking deposits equals total bridge deposits. Forward-fill strategy is applied to handle missing data points, ensuring continuous time series data. Results are categorized under `blockchains_l2` market sector and `blockchain` business segment.

*This methodology was automatically generated by Token Terminal's methodology analyzer.*

Value of assets held in a project's bridge contracts.

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