BITCOIN-NATIVE VERIFICATION

Bitcoin-native.
Agent-to-agent.

Proof21 connects Bitcoin’s public block history with portable evidence, reproducible choices, and policy-based verification across agentic systems.

Explore the protocol The workflow

THE BITCOIN FOUNDATION

Public history.
Independent verification.

Bitcoin supplies a shared reference beyond any one agent or platform: proof-of-work history, reproducible block data, and independently verifiable timestamps.

Public block history

A common reference for evidence across systems.

DMT-resolved source material

Registered elements identify reproducible Bitcoin inputs. P21 binds the source, rules and result in portable evidence; no per-proof mint is required.

Batched commitments

Many evidence digests. One optional Bitcoin timestamp.

Bitcoin in the protocol

01 / THE WORKFLOW

Independent agents.
Verifiable interactions.

Intent. Evidence. Evaluation. Acceptance.

Intent

The initiating agent defines the action, counterparties, constraints, and policy.

Evidence

The executing system returns source records bound to the request.

Evaluation

A verifier evaluates supported claims. Missing evidence remains indeterminate.

Acceptance

The receiving agent applies its policy. A signed decision cannot rewrite verification or settlement.

02 / SHARED PRIMITIVES

Independent agents.
Shared evidence.

Check actions. Reproduce choices. Carry the evidence.

Check

Action verification

Agents compare execution evidence against the exact request.

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Choice / SampleExperimental

Auditable selection

Platforms commit populations and rules before selecting a sample.

Explore

Elements

Digital matter

Resolve supported DMT definitions against Bitcoin data without minting a token for each receipt. Source element to be announced.

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Verify / Accept

Policy-aware decisions

Verify the artifact, apply policy, and optionally bind protected actions to an execution gate.

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Commit

Optional anchoring

Bitcoin timestamps anchor evidence without an on-chain write for every action.

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Interoperate

Portable evidence

Agents exchange verifiable records across platforms and protocols.

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03 / ACROSS PLATFORMS

Connected systems.
Independent policies.

Protocol mappings for agent frameworks, payment rails, and blockchain evidence.

Bitcoin

Binance

Coinbase

MCP

Ethereum

Chainlink

Explore interoperability

NAT community. Open payment choice.

Native NAT and USDC anchor the initial scope. Cross-chain NAT and ecosystem-specific stablecoin rails expand payment choice through individually validated adapters. Receipt verification stays token-free; payment services activate only after settlement testing.

Explore payment architecture

04 / RESEARCH

The ideas behind
the protocol.

Bitcoin, verifiable choices, and evidence between autonomous systems.

Built for agents.
Open to inspection.

Structured resources, complete Markdown, and explicit capability status. No account required to read.

Agent resources

For developers
Offline example

Bitcoin-native.
Agent-to-agent.