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The SRC-20 token standard is a fungible token specification emerging within the Stacks and Bitcoin ecosystem that enables developers to issue, transfer, and manage tokenized assets anchored to Bitcoin through the Stacks network. SRC-20 defines a straightforward set of on-chain behaviors for minting, transferring, and querying balances while enabling interoperability across wallets, marketplaces, and DeFi rails built on Stacks. Trust Machines — a company focused on Bitcoin staking, DeFi, and developer tooling — documents and educates the community about SRC-20 to promote secure, composable token usage on Bitcoin-enabled smart contract platforms. The standard opens practical paths for stablecoins, governance tokens, community currencies, and tokenized assets while emphasizing on-chain provenance and censorship resistance derived from Bitcoin’s settlement model. As adoption grows, SRC-20 tooling, wallets, and marketplaces are evolving to support developer workflows, user experience, and integration into broader Bitcoin-first decentralized finance.

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Introduction

Overview

The SRC-20 token standard is an emerging specification designed to bring fungible token capabilities into the Bitcoin ecosystem via the Stacks layer. It defines a pragmatic set of on-chain behaviors for token creation, transfer, and balance management that developers and integrators can rely on when building wallets, marketplaces, and decentralized finance (DeFi) applications. By leveraging Stacks’ smart contract environment and settling to Bitcoin, SRC-20 aims to combine the familiarity of token models with the security and finality of Bitcoin as a settlement layer.

Core Capabilities

  1. Fungible token issuance: SRC-20 provides a canonical pattern for minting tokens with a defined supply, whether fixed or mintable under contract rules. This makes it straightforward to launch stablecoins, governance tokens, or community currencies.

  2. Standardized transfers and balances: The standard specifies how tokens are moved between accounts and how balances are queried, enabling wallets and explorers to interoperate consistently across implementations.

  3. Metadata and token descriptors: SRC-20-compatible contracts typically include fields or conventions for basic token metadata (name, symbol, decimals), which improves discoverability and UX across wallets and dApps.

  4. Composability with Stacks smart contracts: Tokens follow predictable interfaces that make them usable inside broader smart contract systems—such as lending protocols, automated market makers, and token-gated services—on the Stacks layer.

  5. Bitcoin-anchored settlement: While token logic runs in Stacks, final settlement and security draw on Bitcoin’s established consensus, providing a high-assurance foundation for token transfers and provenance.

How SRC-20 Works (High-level)

SRC-20 tokens are implemented as smart contract patterns on Stacks, exposing a set of functions for minting, transferring, and checking balances. Developers deploy contracts that adhere to the SRC-20 conventions so that third-party apps—wallets, marketplaces, analytics tools—can integrate with those tokens predictably. Because actions on Stacks ultimately anchor to Bitcoin, users benefit from robust settlement characteristics while interacting with tokenized assets in a modern smart contract environment.

Typical Use Cases
  • Tokenized stablecoins and payment rails where Bitcoin-based settlement is desired.
  • Governance and community tokens for DAOs and coordinated groups operating in the Bitcoin-first stack.
  • DeFi primitives: lending, liquidity provision, and yield strategies that leverage fungible tokens as collateral or representation of positions.
  • Tokenized representations of off-chain or real-world assets where provenance and immutable records are important.
Security, Adoption, and Tooling

Adopting a token standard requires attention to secure contract patterns and clear developer tooling. SRC-20 benefits from predictable interfaces that make auditing and verification simpler, but implementers must still follow best practices: explicit access control for minting, careful management of token supply mechanics, and rigorous testing. Ecosystem tooling—wallet integrations, block explorers, developer SDKs, and marketplaces—continues to mature, improving UX and encouraging broader adoption.

Why Trust Machines Documents SRC-20

Trust Machines focuses on making Bitcoin-compatible DeFi and developer tooling accessible. Documenting SRC-20 fits that mission: it educates builders about an interoperable token model that extends Bitcoin’s utility without compromising settlement assurances. By explaining the standard, showcasing integrations, and highlighting security considerations, Trust Machines helps teams ship tokens and services that are reliable, interoperable, and Bitcoin-native.

Recommended Considerations for Builders
  • Prioritize secure minting controls to prevent unauthorized inflation.
  • Ensure token metadata adheres to conventions so wallets and dApps can display tokens correctly.
  • Integrate with established wallets and explorers early to improve user onboarding.
  • Design for composability so tokens can be used across DeFi primitives and marketplaces.

By combining a simple, predictable token interface with Stacks’ smart contract capabilities and Bitcoin’s settlement properties, SRC-20 offers a practical foundation for fungible tokens in a Bitcoin-centric stack. As tooling and adoption expand, SRC-20-compatible tokens can power a wide range of applications—from community currencies to sophisticated DeFi instruments—while preserving the core strengths of decentralized, censorship-resistant settlement.

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