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Notareum Documentation

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The Trust Layer for Web3

Open protocol for verified blockchain resource sharing. One file format. Every chain. Cryptographically verifiable.
Notareum is a Universal Transfer Interface (UTI) protocol that replaces error-prone copy-paste address sharing with verifiable .nota files: portable, cryptographically signed containers for any blockchain resource. A .nota file can represent a wallet address, smart contract, transaction hash, NFT, or IPFS content identifier. It carries chain context, verification status, and a cryptographic signature that proves the resource is exactly what it claims to be. The protocol is secured by a decentralized network of staked validators who attest to resource authenticity, governed by the $NOTA token and its vote-escrowed counterpart veNOTA. Any wallet, exchange, or on-chain application can parse a .nota file, verify its signature, and check validator attestations before a user commits a transaction. The result is a drop-in identity layer for every chain that works without central authorities, custodians, or trusted intermediaries. Notareum is open source. The protocol specification, smart contracts, SDKs in TypeScript, Python, and Rust, and a growing library of examples are all available on GitHub. This documentation covers the full protocol, token design, developer tooling, operator guides, and integration patterns.

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Architecture at a glance

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Who this is for

  • Wallet and dapp developers integrating verified resource sharing.
  • Exchange and custodian teams hardening deposit flows against phishing.
  • Validator operators staking NOTA to attest to resources.
  • Protocol designers studying the economic and cryptographic model.
  • End users who want to understand what .nota files are and why they matter.

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Repository map

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Core principles

  1. Chain Agnostic. Every major blockchain, every resource type.
  2. Human Readable. A .nota file is JSON you can read without tools.
  3. Cryptographically Verifiable. Every file carries a signature.
  4. Extensible. Schema versioning and governance-added resource types.
  5. Lightweight. Typical files are 1 to 2 KB, portable over any channel.
Dive in with What is Notareum, or jump straight to the Quick Start.