Linea batches users' transactions and submits them to Ethereum, paying a share of the transaction fees to Ethereum validators (expense).

Linea is an L2 smart contract platform for decentralized applications on Ethereum. Linea was founded by the ConsenSys team and launched in 2023.

ConsenSys team owns and governs the protocol. ConsenSys's investors include ParaFi Capital, Microsoft, Coinbase Ventures, etc.

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Linea

# Linea Bridge deposits Methodology

## 1. Overview

Linea bridge deposits measures the total USD value of assets held in Linea's Ethereum bridge contracts. This metric quantifies the amount of capital that users have deposited into the Linea bridge system, providing insight into the bridge's total value locked (TVL) and user adoption. The calculation tracks token balances across multiple bridge contract addresses and converts them to USD using end-of-day price feeds.

## 2. Data sources

The calculation relies on several key data sources:
- **Ethereum blockchain transaction data**: Complete transaction records to track balance changes in bridge contracts
- **Ethereum event logs and traces**: Detailed transaction execution data including internal transfers and contract interactions
- **ERC-20 token transfer events**: Parsed `Transfer` events from Ethereum to track token movements into and out of bridge contracts
- **Native ETH balance tracking**: ETH balance changes for bridge contract addresses
- **End-of-day token price feeds**: Daily USD prices for all tokens held in the bridge contracts
- **Token metadata**: Contract addresses, decimal places, and token symbols for proper balance calculations

## 3. Step-by-step calculation

### Component A: Bridge contract identification
- **Purpose**: Identifies the specific Ethereum addresses that serve as Linea bridge contracts
- **Logic**: The calculation focuses on three hardcoded Ethereum contract addresses: `0xd19d4b5d358258f05d7b411e21a1460d11b0876f`, `0x051f1d88f0af5763fb888ec4378b4d8b29ea3319`, and `0x504a330327a089d8364c4ab3811ee26976d388ce`. These addresses represent the official Linea bridge contracts that hold user deposits
- **Key fields**: `account_addresses` contain the bridge contract addresses on Ethereum

### Component B: Portfolio balance calculation
- **Purpose**: Calculates the complete portfolio of assets held by the bridge contracts over time
- **Logic**: Uses the calculate_portfolio macro to track all token balances across the three bridge contract addresses. This includes both native ETH and all ERC-20 tokens held by these contracts. The macro processes transaction traces and transfer events to maintain accurate balance histories, tracking inflows from user deposits and outflows from bridge withdrawals
- **Key fields**: `balance` represents the token amount, `timestamp` for time tracking, `chain` for blockchain identification

### Component C: USD conversion and aggregation
- **Purpose**: Converts all token balances to USD values and aggregates across contracts
- **Logic**: Applies end-of-day price feeds to convert each token balance to USD value. The calculation corrects for token decimals to ensure accurate pricing. All balances across the three bridge contract addresses are summed to get the total bridge deposits value
- **Key fields**: `balance` converted to USD, `bridge_deposits` as the aggregated total value

### Component D: Business categorization
- **Purpose**: Assigns appropriate business classification to the metric
- **Logic**: Categorizes the metric under the 'blockchains_l2' market sector since Linea is a Layer 2 solution, and 'blockchain' business segment. No specific product categorization is applied
- **Key fields**: `market_sector_id` set to 'blockchains_l2', `business_segment_id` set to 'blockchain', `product_id` set to null

### Final aggregation
- **Combining components**: The portfolio values from all three bridge contract addresses are summed together to create a single `bridge_deposits` value representing total assets held in the Linea bridge system
- **Currency conversion**: All token balances are converted to USD using end-of-day price feeds with proper decimal corrections applied through the portfolio calculation macro
- **Time aggregation**: Data is aggregated by timestamp and timestamp grain, with a forward-filling strategy applied to handle missing data points
- **Final calculation**: The final metric represents the total USD value of all tokens (ETH and ERC-20) held across the three Linea bridge contract addresses at each point in time, providing a measure of the bridge's total value locked

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

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

LineaLINEA

Bridge deposits

Bridge deposits

Competitive landscape

Chain breakdown