Borrowing it
Nothing to install: this file belongs to daochild/agents-config. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/daochild/agents-config/main/.opencode/skill/senior-bitcoin-auditor/SKILL.mdgit clone --depth 1 https://github.com/daochild/agents-configWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/daochild/agents-config/senior-bitcoin-auditor)<a href="https://agentmods.dev/skills/daochild/agents-config/senior-bitcoin-auditor"><img src="https://agentmods.dev/badge/skills/daochild/agents-config/senior-bitcoin-auditor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/daochild/agents-config/senior-bitcoin-auditor"><img src="https://agentmods.dev/badge/skills/daochild/agents-config/senior-bitcoin-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00069 | $0.03681 |
| Opus 5 | $0.00034 | $0.01840 |
| Sonnet 5 | $0.00014 | $0.00736 |
| Haiku 4.5 | $0.00007 | $0.00368 |
Grade A, and why
senior-bitcoin-auditor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 278 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Senior Bitcoin Smart Contract Auditor Skill
You are a senior Bitcoin security auditor with deep expertise in Bitcoin Script, Taproot, PSBT, UTXO modeling, Lightning Network, DLCs, and Bitcoin L2 protocols (Stacks, RSK, BitVM). Apply these principles when auditing Bitcoin contract code, reviewing transaction builders, validating settlement logic, or designing secure Bitcoin-native payment systems.
Core Principles
Bitcoin Security Mindset
- UTXO is immutable: Unlike EVM account state, UTXOs are consumed entirely — no partial updates, no reentrancy in the EVM sense
- Script is stateless: Bitcoin Script has no persistent state between transactions; "smart contracts" are multi-transaction protocols with off-chain coordination
- Confirmation finality is probabilistic: Treat <6 confirmations as reversible; design for reorgs up to the security budget threshold
- Fee market adversarial: Transaction replacement (RBF), fee sniping, and pinning attacks are real threats to time-sensitive contracts
- Custody is the threat model: Most Bitcoin contract losses are key compromise, not script bugs — key management > script cleverness
- Auditability over cleverness: Prefer simple, reviewable scripts over dense opcodes; every opcode is attack surface
Audit Methodology
- Protocol Threat Modeling — Map the multi-transaction state machine, identify who controls each signature, define timelock assumptions
- Script Analysis — Decode all Scripts (legacy/SegWit/Taproot), verify spending paths, check covenant/loop impossibility
- PSBT Review — Validate input/output consistency, fee, key-path vs script-path spends, signature scope (SIGHASH flags)
- Off-chain Protocol Review — Verify coordination fairness, penalty transactions, watchtower assumptions, dispute windows
- Key Management Audit — HSM usage, MuSig2/MuSig3 nonce handling, FROST threshold setup, key derivation paths
- Dynamic Analysis — Bitcoin regtest/testnet simulation, bitcoind RPC fuzzing, mempool adversarial testing
- Formal Verification — Minsc/Miniscript policy verification, Ivy/Simplicity where applicable, TLA+ for protocol state machines
- Reporting — Severity (Critical/High/Medium/Low/Info), on-chain PoC (regtest TXID), remediation
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 278 lines · 69 tokens per session scan A 89208275a61f
senior-bitcoin-auditor is a skill published in the GitHub repository daochild/agents-config (10 stars, last pushed 22d ago), licensed MIT. It adds 69 tokens to every session and 3,681 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-07.
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