satsignal-cli 0.2.0

Customer-facing CLI for Satsignal — anchor and verify files against the BSV-anchored notary.

satsignal-cli

Customer-facing CLI for Satsignal — anchor and verify files against the BSV-anchored notary.

Status: v0.1 draft. Standard-mode anchor + verify works end-to-end. Sealed mode is verify-only (you can verify a sealed bundle produced by the web UI; producing one from the CLI lands in v0.2). Multi-proof (content_canonical, chunk_merkle) verification falls back to the web verifier at /verify.

Install

pip install satsignal-cli                # Python 3.11+
pip install 'satsignal-cli[toml-py39]'   # Python 3.9 / 3.10

Quickstart

satsignal login                       # paste your API key (sk_…)
satsignal anchor report.pdf           # dry-run preview
satsignal anchor report.pdf --broadcast
# → writes report.pdf.mbnt next to the file
satsignal verify report.pdf
# → chain-confirms by default; exit 0 on success

Commands

verb	purpose
satsignal anchor <file>	anchor a file; dry-run by default, writes <file>.mbnt on --broadcast
satsignal verify <file>	verify a file against its .mbnt sidecar; chain-confirms by default
satsignal show <bundle>	print receipt details (txid, mode, proofs, etc.)
satsignal log	list recent anchors from ~/.local/state/satsignal/anchors.jsonl
satsignal login	store API key in ~/.config/satsignal/credentials.toml
satsignal matters	list workspace matters

Sidecar convention

satsignal anchor writes <file>.mbnt next to the source by default. Override with -o. satsignal verify looks for the sidecar in this order:

1. <file>.mbnt directly next to the source
2. .satsignal/<single-bundle>.mbnt in the source's parent directory (only if there's exactly one — otherwise pass --bundle explicitly)

This convention mirrors GPG's .asc / RFC 3161's .tsr — one file in, one receipt out, same directory.

Configuration

Reads (in order, first wins):

1. Environment: SATSIGNAL_API_KEY, SATSIGNAL_BASE_URL, SATSIGNAL_MATTER, SATSIGNAL_PROOF_URL
2. ~/.config/satsignal/credentials.toml (mode 600)
3. Defaults: base_url = https://app.satsignal.cloud, proof_url = https://proof.satsignal.cloud, matter = inbox

The credentials file is plain TOML:

api_key  = "sk_..."
base_url = "https://app.satsignal.cloud"
matter   = "inbox"

Verify semantics

satsignal verify implements the conformant procedure from bundle-v1.md §7 in order:

1. Open ZIP, parse manifest.json / canonical.json / proofs.json (if present)
2. Cryptographic check (standard: SHA-256; sealed: HMAC-SHA256 with master salt)
3. doc_hash consistency via JCS-canonical SHA-256
4. Chain confirmation — fetch raw tx, parse OP_RETURN MBNT payload, compare doc_hash

Exit codes match bundle-v1.md §8:

exit	class	meaning
0	VERIFIED / PENDING / OFFLINE	crypto + chain OK (PENDING = 0 confirmations; OFFLINE = chain skipped)
1	CRYPTO	bundle malformed or hashes don't match
2	CHAIN	bundle is valid but the on-chain anchor doesn't commit to this canonical doc
3	NETWORK	couldn't reach WhatsOnChain / Bitails
4	(auth)	API key missing or rejected (anchor flow only)
5	(bundle not found)
6	VERSION	mbnt_version unsupported by this CLI

PENDING returning exit 0 is intentional — satsignal verify && cp report.pdf out/ should succeed the moment the anchor is broadcast. Opt into stricter gating with --min-confirmations N.

Offline mode

satsignal verify --offline skips the chain check. The warning ("locally-fabricated bundles pass crypto-only checks") is non-suppressible — --quiet does not silence it. This matches the chain-confirm-by-default rule from the spec; making the chain check opt-in by default would invert the safety property the protocol exists to provide.

What v0.1 deliberately omits

• Sealed-mode anchoring. The CLI can verify sealed bundles, but can't produce them (requires client-side HKDF + HMAC + bundle assembly). Use sealed.satsignal.cloud until v0.2.
• content_canonical / chunk_merkle verification. These require porting the verifier.html canonicalizers (text-norm-v1, json-jcs-v1, csv-norm-v1, etc.) to Python. The CLI flags their presence and points to the web verifier for now.
• Manifest mode (Phase 8b). Out of scope for v0.1.
• --watch / --bulk. Single-file anchors only.

See also

• Bundle format spec: https://proof.satsignal.cloud/spec-bundle
• LangChain integration: https://github.com/Steleet/langchain-satsignal
• API docs: https://app.satsignal.cloud/docs