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

Scroll is an L2 smart contract platform for decentralized applications on Ethereum. Scroll was founded by Sandy Peng, Haichen Shen, and Ye Zhang and launched in 2023.

SCR tokenholders own and govern the protocol. Scroll's investors include Polychain, Qiming Venture Partners, etc.

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Scroll

# Scroll Bridge deposits Methodology

## 1. Overview

Scroll bridge deposits measures the total USD value of tokens held in Scroll's bridge contracts on Ethereum. This metric tracks the value locked in the bridge infrastructure that facilitates transfers between Ethereum mainnet and Scroll's Layer 2 network. The calculation aggregates token balances across eight specific Ethereum addresses that serve as Scroll's official bridge contracts, providing insight into the total value secured by the bridge at any given time.

## 2. Data sources

- **Ethereum token transfer events**: Parsed `Transfer` events from ERC-20 tokens and ETH transfers to track token movements into and out of bridge addresses
- **Ethereum transaction traces**: Internal transaction data to capture ETH balance changes in bridge contracts
- **Token balance snapshots**: Daily aggregated token balances for each bridge address
- **End-of-day token price feeds**: USD price data for converting token amounts to dollar values
- **Token metadata registry**: Token contract information including decimal places, symbols, and contract addresses
- **Chain availability configuration**: Data quality filters to ensure complete Ethereum data coverage

## 3. Step-by-step calculation

### Component A: Bridge address identification
- **Purpose**: Define the specific Ethereum addresses that serve as Scroll's bridge contracts
- **Logic**: Uses eight hardcoded Ethereum bridge addresses: `0x6774bcbd5cecef1336b5300fb5186a12ddd8b367`, `0xd8a791fe2be73eb6e6cf1eb0cb3f36adc9b3f8f9`, `0xf1af3b23de0a5ca3cab7261cb0061c0d779a5c7b`, `0x6625c6332c9f91f2d27c304e729b86db87a3f504`, `0x6260af48e8948617b8fa17f4e5cea2d21d21554b`, `0xb94f7f6abcb811c5ac709de14e37590fccd975b6`, `0x7f2b8c31f88b6006c382775eea88297ec1e3e905`, and `0xb2b10a289a229415a124efdef310c10cb004b6ff`. These addresses represent different components of Scroll's bridge infrastructure
- **Key fields**: `account_addresses` array containing the eight bridge contract addresses on Ethereum

### Component B: Portfolio balance calculation
- **Purpose**: Calculate daily token balances held in each bridge address
- **Logic**: Processes Ethereum `Transfer` events and transaction traces to determine the balance of each token (including ETH) held in the bridge addresses. Tracks inflows from deposits and outflows from withdrawals to maintain accurate balance accounting. Aggregates balance changes to produce daily snapshots of token holdings for each address
- **Key fields**: `balance` representing the token amount held, `timestamp` for daily aggregation boundaries, `chain` identifying Ethereum as the source blockchain

### Component C: Business classification
- **Purpose**: Add business context and categorization metadata
- **Logic**: Assigns business-relevant classifications to the bridge deposits data. Sets `market_sector_id` to "blockchains_l2" to categorize this as Layer 2 blockchain infrastructure. Sets `business_segment_id` to "blockchain" to identify this as core blockchain functionality. Leaves `product_id` as null since this represents infrastructure-level deposits rather than a specific product
- **Key fields**: `market_sector_id`, `business_segment_id`, `product_id` for business categorization

### Component D: Balance aggregation
- **Purpose**: Combine token balances across all eight bridge addresses
- **Logic**: Sums the `balance` values for each token across all eight bridge addresses to calculate the total amount of each token held in the bridge infrastructure. Groups by timestamp, chain, and business metadata fields to maintain proper aggregation boundaries
- **Key fields**: `bridge_deposits` containing the aggregated balance sum for each token and time period

### Final aggregation
- **Combining components**: All token balances from the eight bridge addresses are summed together to create a single `bridge_deposits` value representing total tokens held in the bridge
- **Currency conversion**: Token amounts are converted to USD values using end-of-day price feeds, with proper decimal place adjustments based on each token's metadata
- **Time aggregation**: Data is aggregated to daily boundaries, with forward-fill strategy applied to handle missing data points and ensure continuous time series
- **Final calculation**: The final metric represents the total USD value of all tokens (ERC-20 tokens plus ETH) held across Scroll's eight bridge contract addresses on Ethereum, updated daily and forward-filled for data continuity

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

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

ScrollSCR

Bridge deposits

Bridge deposits

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Chain breakdown