zkSync Era batches users' transactions and submits them to Ethereum together with a zero-knowledge proof, paying a share of the transaction fees to Ethereum validators (expense).

zkSync Era is an L2 smart contract platform for decentralized applications on Ethereum. zkSync Era was founded by Matter Labs and launched in 2023.

Matter Labs team owns and governs the protocol. Matter Labs' investors include a16z, Lightspeed Venture Partners, Blockchain Capital, etc.

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zkSync Era

# zkSync Era Bridge deposits Methodology

## 1. Overview

Bridge deposits represents the total USD value of all tokens held in zkSync Era's official bridge contracts on Ethereum. This metric measures the total value locked (TVL) in the zkSync Era ecosystem by tracking token balances in the bridge smart contracts that facilitate deposits from Ethereum to zkSync Era. The calculation monitors three specific Ethereum addresses that serve as zkSync Era's official bridge contracts and aggregates the total value of all tokens held across these addresses.

## 2. Data sources

- **Ethereum blockchain events**: Parsed `Transfer` events from ERC20 tokens and ETH transfers to track token movements into and out of bridge addresses
- **Transaction data**: Ethereum transaction records and traces to identify all token transfer activity
- **External data**: End-of-day token price feeds for USD conversion of token balances, token metadata including contract addresses and decimal specifications
- **Balance snapshots**: Daily token balance calculations for each monitored bridge address across all supported tokens

## 3. Step-by-step calculation

### Component A: Bridge address monitoring
- **Purpose**: Identifies the specific Ethereum addresses that represent zkSync Era's official bridge contracts
- **Logic**: Three hardcoded Ethereum addresses are monitored: `0x57891966931eb4bb6fb81430e6ce0a03aabde063`, `0x32400084c286cf3e17e7b677ea9583e60a000324`, and `0xd7f9f54194c633f36ccd5f3da84ad4a1c38cb2cb`. These addresses represent the official zkSync Era bridge smart contracts on Ethereum that hold deposited funds
- **Key fields**: `account_addresses` contains the three bridge contract addresses to monitor

### Component B: Portfolio balance calculation  
- **Purpose**: Calculates the current token balances held at each bridge address across all supported tokens
- **Logic**: Uses parsed `Transfer` events and transaction data to track token movements into and out of the bridge addresses. For each token contract, maintains running balance totals by processing inbound and outbound transfers. Handles both ERC20 tokens and native ETH transfers. Applies proper decimal normalization based on token metadata to ensure accurate balance calculations
- **Key fields**: `balance` represents the token quantity held at each address, `timestamp` for temporal tracking, `chain` identifying Ethereum as the source blockchain

### Component C: Business metadata assignment
- **Purpose**: Adds relevant business dimensions and classifications to the balance data
- **Logic**: Assigns `market_sector_id` as 'blockchains_l2' to categorize zkSync Era as a Layer 2 blockchain, sets `business_segment_id` as 'blockchain' for segment classification, sets `product_id` as null since this represents overall bridge deposits rather than a specific product, and preserves `chain_id` from the source data
- **Key fields**: `market_sector_id`, `business_segment_id`, `product_id`, `chain_id` for business reporting structure

### Final aggregation
- **Combining components**: Sums the `balance` field across all three bridge addresses and all tokens to calculate total bridge deposits. Groups results by `timestamp`, `timestamp_grain`, `chain_id`, and business dimensions to maintain proper aggregation levels
- **Currency conversion**: Converts token balances to USD using end-of-day price feeds, applying appropriate decimal corrections based on token specifications. The conversion ensures all balances are expressed in comparable USD terms
- **Time aggregation**: Maintains daily granularity through `timestamp_grain` grouping while preserving exact timestamps for precise temporal tracking
- **Final calculation**: The final `bridge_deposits` value represents the total USD value of all tokens held across zkSync Era's three bridge contracts on Ethereum. Applies forward-fill strategy to handle any missing data points and chain availability filtering to exclude periods with unreliable blockchain data

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

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

zkSync EraZK

Bridge deposits

Bridge deposits

Competitive landscape

Chain breakdown