Standards for Indexing & Metadata
Standards for Indexing & Metadata
Indexing and metadata standards are critical for ensuring that wallets, explorers, and dApps can correctly interpret and display onchain activity. Modulax follows Ethereum-compatible standards while introducing forward-looking extensions to support modularity and quantum readiness.
"A blockchain is only as visible as the data it exposes. Clean indexing ensures Modulax integrates seamlessly with the wider ecosystem."
Token Standards
Modulax supports standard Ethereum token formats for immediate compatibility.
ERC-20 for fungible tokens
ERC-721 for non-fungible tokens
ERC-1155 for multi-token collections
Each contract must emit Transfer events and follow standard interfaces to be automatically indexed by explorers like Blockscout and wallets like Zerion.
ERC-20
Fungible assets
Fully supported
ERC-721
Non-fungible assets (NFTs)
Metadata URIs indexed via RPC
ERC-1155
Multi-token standard
Suitable for game assets & bundles
Metadata Requirements
For proper indexing, contracts should expose metadata through standard fields:
ERC-20: name, symbol, decimals
ERC-721: tokenURI for each unique token ID
ERC-1155: uri method with {id} substitution
"Metadata is not optional. Without it, your token is invisible in wallets and explorers."
Event Logs
Event logs are the primary way external systems detect activity. Modulax requires clean and compliant event emissions.
ERC-20
Transfer(address,address,uint256), Approval(address,address,uint256)
ERC-721
Transfer(address,address,uint256), Approval(address,uint256)
ERC-1155
TransferSingle , TransferBatch , ApprovalForAll
Explorers and indexers rely on these events to build token balances, history, and user activity.
Indexing in Modulax
Blockscout is the reference indexer for Modulax. It processes:
Native transactions
ERC-20 and ERC-721 token transfers
Internal calls and contract creations
Verified contract source code
For wallets, Zerion auto-detects Modulax tokens when events follow ERC standards and RPC logs are valid.
Checklist for developers:
Always emit Transfer events in compliance with ERCs
Validate metadata URIs return proper JSON
Test contract indexing on the Modulax testnet explorer
Extended Metadata (Future)
As Modulax adopts post-quantum upgrades, metadata standards may extend to include:
PQ signature type indicators
Chain-specific identifiers for modular extensions
Quantum vault metadata for specialized contracts
These extensions will remain backward-compatible with ERC standards to avoid breaking existing integrations.
Conclusion
Indexing and metadata ensure that tokens, contracts, and dApps built on Modulax are visible and usable across the EVM ecosystem. By following ERC standards and preparing for PQ extensions, Modulax guarantees smooth compatibility today and resilience tomorrow.
"Clean data is the bridge between raw blocks and real adoption. Modulax is committed to standards that keep its ecosystem open, transparent, and future-ready."
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