Configuration

Every appsettings.json key for Lacuna Bulk Signer — type, default, environment-variable override, and whether it is required.

Configuration sources, in precedence order

Later sources override earlier ones:

1. appsettings.json (built-in defaults)
2. appsettings.{Environment}.json (e.g. appsettings.Production.json)
3. appsettings.json + appsettings.{Environment}.json found under BULK_SIGNER_CONFIG_DIR
4. Environment variables (Section__Sub__Key)

The BULK_SIGNER_CONFIG_DIR step is what lets the binary live in a read-only install location (/opt/bulksigner, %ProgramFiles%\Lacuna\BulkSigner) while the operator-edited production config lives elsewhere (/etc/bulksigner, %ProgramData%\Lacuna\BulkSigner\config). The install scripts set this variable; if you change install paths, update the variable in lockstep.

Environment-variable mapping follows the ASP.NET Core rule: a JSON key like Signing:Certificate:Pfx:Password maps to Signing__Certificate__Pfx__Password (double underscore is the separator).

Markers used in the tables

Marker	Meaning
REQUIRED	The service refuses to start (or signing refuses to run) without a non-empty value.
SECRET	Sensitive — prefer the environment-variable override over a value committed to a file.

Logging / Logging:File

Standard Microsoft.Extensions.Logging knobs (Logging:LogLevel:*) work as usual; the Logging:File block configures the file sink.

Key	Type	Default	Env override	Notes
Logging:LogLevel:Default	string	Information	Logging__LogLevel__Default	Standard logging level.
Logging:LogLevel:Microsoft.AspNetCore	string	Warning	Logging__LogLevel__Microsoft.AspNetCore	Lowers framework chatter.
Logging:File:Path	string	data/logs/bulksigner-.log	Logging__File__Path	REQUIRED. File-sink path template. The trailing - before .log plus daily rolling produces bulksigner-yyyyMMdd.log.
Logging:File:RollingInterval	string	Day	Logging__File__RollingInterval	One of Day, Hour, Minute, Infinite.
Logging:File:FileSizeLimitBytes	long	50000000	Logging__File__FileSizeLimitBytes	Per-file cap; the sink rolls to …_001.log past this. Bounds: 64 KB to 10 GB.
Logging:File:RetainedFileCountLimit	int	14	Logging__File__RetainedFileCountLimit	Older files are deleted as rotation advances. Bounds: 1–365.
Logging:File:MinimumLevel	string	Information	Logging__File__MinimumLevel	One of Verbose, Debug, Information, Warning, Error, Fatal.
Logging:File:WriteToConsole	bool	true	Logging__File__WriteToConsole	When true, also writes to stdout. The same redacting formatter runs on both sinks.

ConnectionStrings

Key	Type	Default	Env override	Notes
ConnectionStrings:Default	string	Data Source=data/db/bulksigner.db	ConnectionStrings__Default	REQUIRED. SQLite connection string. Point at a path under Storage:Root so one mount covers both data and DB.

Signing

Validation fails fast at startup if any required key is missing or invalid.

Key	Type	Default	Env override	Notes
Signing:PkiSdkLicense	string	""	Signing__PkiSdkLicense	REQUIRED, SECRET. Lacuna PKI SDK license string (base64). Environment-variable form preferred.
Signing:Certificate:Source	enum	Pfx	Signing__Certificate__Source	REQUIRED. One of Pfx, Pkcs11, WindowsStore, AzureKeyVault. Only the matching subtree below is consulted.

Signing:Certificate:Pfx — when Source = Pfx

Key	Type	Default	Env override	Notes
Signing:Certificate:Pfx:Path	string	""	Signing__Certificate__Pfx__Path	REQUIRED. Absolute path to the .pfx/.p12 file.
Signing:Certificate:Pfx:Password	string	""	Signing__Certificate__Pfx__Password	SECRET. Empty string is allowed for passwordless test fixtures. Prefer the env-var form.

Signing:Certificate:Pkcs11 — when Source = Pkcs11

Key	Type	Default	Env override	Notes
Signing:Certificate:Pkcs11:ModulePath	string	""	Signing__Certificate__Pkcs11__ModulePath	REQUIRED. Absolute path to the vendor PKCS#11 driver (.so/.dll/.dylib).
Signing:Certificate:Pkcs11:Thumbprint	string	""	Signing__Certificate__Pkcs11__Thumbprint	REQUIRED. SHA-1 thumbprint (hex, no spaces) of the signing cert on the token. Required even when the token holds a single identity.
Signing:Certificate:Pkcs11:PinEnvVar	string	BULK_SIGNER_PKCS11_PIN	Signing__Certificate__Pkcs11__PinEnvVar	Name of the env var that supplies the PIN. The validator refuses to start if a literal Pin key appears under Pkcs11.

Signing:Certificate:WindowsStore — when Source = WindowsStore

Windows-only. The validator refuses this source on non-Windows hosts at startup.

Key	Type	Default	Env override	Notes
Signing:Certificate:WindowsStore:StoreLocation	string	CurrentUser	Signing__Certificate__WindowsStore__StoreLocation	CurrentUser or LocalMachine. Use LocalMachine when the cert was imported machine-wide; the service account does not see the operator's CurrentUser store.
Signing:Certificate:WindowsStore:StoreName	string	My	Signing__Certificate__WindowsStore__StoreName	Logical store name. My is the personal store.
Signing:Certificate:WindowsStore:Thumbprint	string	""	Signing__Certificate__WindowsStore__Thumbprint	REQUIRED. SHA-1 thumbprint (hex, no spaces).

Signing:Certificate:AzureKeyVault — when Source = AzureKeyVault

The private key stays in the vault and each signature is a remote sign call; the public certificate is a local .cer file. All five keys are required — startup fails naming each missing one.

Key	Type	Default	Env override	Notes
Signing:Certificate:AzureKeyVault:Endpoint	string	""	Signing__Certificate__AzureKeyVault__Endpoint	REQUIRED. Vault URL. Must be an absolute https:// URL — a bare DNS name is refused at startup.
Signing:Certificate:AzureKeyVault:AppId	string	""	Signing__Certificate__AzureKeyVault__AppId	REQUIRED. Application (client) ID of the Microsoft Entra ID app registration.
Signing:Certificate:AzureKeyVault:AppSecret	string	""	Signing__Certificate__AzureKeyVault__AppSecret	REQUIRED, SECRET. Entra ID client secret. Unlike the PKCS#11 PIN this is permitted in a config file, but the env-var form is recommended.
Signing:Certificate:AzureKeyVault:KeyName	string	""	Signing__Certificate__AzureKeyVault__KeyName	REQUIRED. Name of the key object in the vault that performs the signature. A vault certificate object is not accepted.
Signing:Certificate:AzureKeyVault:CerPath	string	""	Signing__Certificate__AzureKeyVault__CerPath	REQUIRED. Path to the .cer holding the public certificate for KeyName. Boot fails if its public key does not match the vault key.

See Certificates for thumbprint discovery commands, the Azure setup walkthrough, and a deeper look at each source.

Signing:Profiles[] — per-folder signing profiles

A signing profile bundles every per-folder decision (format, certificate, verify, encrypt, certificate validation) under a name. Watched folders reference the profile by name via Storage:Inputs[].Profile. Two configuration modes are supported:

• Legacy mode (default — Signing:Profiles[] omitted or empty). The service synthesises one profile named default from the existing Signing:Certificate block. No config changes are needed for a simple single-certificate install.
• Profile mode (declare Signing:Profiles[]). Each entry is a named profile with its own certificate and posture. Signing:Certificate is ignored. Every entry validates as if it were the global certificate block — the same Pfx / Pkcs11 / WindowsStore / AzureKeyVault rules apply per profile.

Key	Type	Default	Env override	Notes
Signing:Profiles[].Name	string	n/a	Signing__Profiles__0__Name	REQUIRED. Same regex as folder names: ^[a-z0-9](?:[a-z0-9-]{0,38}[a-z0-9])?$. Unique across the list. The name is referenced from Storage:Inputs[].Profile and surfaces in metric labels, dashboard chips, and audit messages.
Signing:Profiles[].Format	enum	n/a	Signing__Profiles__0__Format	REQUIRED for every operator-declared profile: Pades, Cades, Xades, or XmlNFe. Only the synthesised legacy default may leave this unset — in which case the format is detected per file by extension.
Signing:Profiles[].Method	enum	Local	Signing__Profiles__0__Method	Local (sign with the configured local certificate) or LacunaSigner (dispatch to Lacuna Signer for a human participant). See Lacuna Signer integration.
Signing:Profiles[].Verify	bool	true	Signing__Profiles__0__Verify	When false, the worker skips the post-sign verification round-trip. The startup banner emits a warning so the low-trust posture is operator-visible.
Signing:Profiles[].Encrypt	bool	false	Signing__Profiles__0__Encrypt	When true, the worker AES-256-GCM-encrypts the signed output. Requires Encryption:Enabled = true (the validator refuses the broken combination at startup).
Signing:Profiles[].ValidateCertificate	bool	true	Signing__Profiles__0__ValidateCertificate	When false, the worker skips the pre-sign certificate chain / revocation check. The startup banner emits a warning. Must be false when Method = LacunaSigner — there is no local cert to validate.
Signing:Profiles[].Certificate.*	nested	n/a	Signing__Profiles__0__Certificate__…	REQUIRED when Method = Local. Same shape as the global Signing:Certificate block. Each profile loads its own certificate at boot; misconfiguration on any profile fails startup with an aggregated error. Refused when Method = LacunaSigner.
Signing:Profiles[].Signer.Name	string	n/a	Signing__Profiles__0__Signer__Name	REQUIRED when Method = LacunaSigner. Display name of the participant Lacuna Signer will send the document to.
Signing:Profiles[].Signer.Email	string	n/a	Signing__Profiles__0__Signer__Email	REQUIRED when Method = LacunaSigner. Participant's email address — must contain @.
Signing:Profiles[].Signer.Identifier	string	n/a	Signing__Profiles__0__Signer__Identifier	REQUIRED when Method = LacunaSigner. Participant's national identifier (CPF in Brazil).

Storage:Inputs[].Profile — per-folder routing

Key	Type	Default	Env override	Notes
Storage:Inputs[].Profile	string?	null (→ "default")	Storage__Inputs__0__Profile	Optional. References a Signing:Profiles[].Name. Null or empty falls back to the default profile. Unknown names fail validation at startup.

Example: three profiles routed by folder, one per certificate source

"Signing": {
  "PkiSdkLicense": "<env-var>",
  "Profiles": [
    {
      "Name": "nfe",
      "Format": "Xades",
      "Verify": true,
      "Encrypt": false,
      "ValidateCertificate": true,
      "Certificate": {
        "Source": "Pkcs11",
        "Pkcs11": { "ModulePath": "/usr/lib/x86_64-linux-gnu/pkcs11/libsofthsm2.so", "Thumbprint": "...", "PinEnvVar": "BULK_SIGNER_PKCS11_PIN" }
      }
    },
    {
      "Name": "contracts",
      "Format": "Pades",
      "Verify": true,
      "Encrypt": true,
      "ValidateCertificate": true,
      "Certificate": {
        "Source": "Pfx",
        "Pfx": { "Path": "/etc/bulksigner/contracts.pfx", "Password": "" }
      }
    },
    {
      "Name": "invoices",
      "Format": "Pades",
      "Verify": true,
      "Encrypt": false,
      "ValidateCertificate": true,
      "Certificate": {
        "Source": "AzureKeyVault",
        "AzureKeyVault": {
          "Endpoint": "https://my-vault.vault.azure.net/",
          "AppId": "8f2c1b3e-1111-2222-3333-444455556666",
          "AppSecret": "",
          "KeyName": "bulk-signer-invoices-key",
          "CerPath": "/etc/bulksigner/certificates/invoices.cer"
        }
      }
    }
  ]
},
"Storage": {
  "Root": "/var/lib/bulksigner",
  "Inputs": [
    { "Name": "nfe-incoming",       "Path": "/var/lib/bulksigner/input-nfe",       "Profile": "nfe" },
    { "Name": "contracts-incoming", "Path": "/var/lib/bulksigner/input-contracts", "Profile": "contracts" },
    { "Name": "invoices-incoming",  "Path": "/var/lib/bulksigner/input-invoices",  "Profile": "invoices" }
  ]
}

The invoices profile leaves AppSecret empty in the file and takes it from the environment instead. Array elements are bound by positional index, so the secret for the third profile is:

export Signing__Profiles__2__Certificate__AzureKeyVault__AppSecret='…'

warning

That index is positional, not name-based. Inserting a new profile above invoices shifts it to index 3, the index-2 variable stops reaching it, and startup fails with Signing:Profiles[3].Certificate.AzureKeyVault.AppSecret is required. Re-check every indexed environment variable after reordering the list.

The startup banner lists every resolved profile with its format, certificate source, and verify/encrypt/validate-cert flags. Profiles with Verify=false or ValidateCertificate=false emit additional warnings so the low-trust posture is captured in durable logs.

Signer — Lacuna Signer connection

One Lacuna Signer tenant per host — the endpoint and API key are global, not per-profile. The validator is self-gating: it only enforces Endpoint + ApiKey when at least one Signing:Profiles[] entry has Method = LacunaSigner. Local-only deployments don't need to configure any of this. See Lacuna Signer integration.

Key	Type	Default	Env override	Notes
Signer:Endpoint	string	""	Signer__Endpoint	REQUIRED when any profile uses LacunaSigner. Base URL for the Lacuna Signer instance. Cloud default: https://signer.lacunasoftware.com. On-prem deployments point at the customer's instance.
Signer:ApiKey	string	""	Signer__ApiKey	REQUIRED, SECRET when any profile uses LacunaSigner. Expected shape: application-id|secret. The literal value is scrubbed from logs.
Signer:PollIntervalSeconds	int	30	Signer__PollIntervalSeconds	How often the poll worker walks every AwaitingSigner row. Bounds: 1–3600.
Signer:TimeoutHours	int	168 (7 days)	Signer__TimeoutHours	How long a job may sit in AwaitingSigner before it is failed with code = signer.timeout. Bounds: 1–8760.
Signer:MaxConsecutiveApiFailures	int	5	Signer__MaxConsecutiveApiFailures	Per-document consecutive transient-error budget before the poll worker gives up on that document. In-memory counter — restart resets it.

Encryption

Off by default. The validator runs only when Enabled = true.

Key	Type	Default	Env override	Notes
Encryption:Enabled	bool	false	Encryption__Enabled	Master switch. When true, the worker AES-256-GCM-encrypts the signed artifact between verify and promote.
Encryption:Password	string	""	Encryption__Password	SECRET. PBKDF2 password. Allowed in config (use appsettings.Production.json, which is gitignored) but env-var form is preferred.
Encryption:PasswordEnvVar	string	BULK_SIGNER_ENCRYPTION_PASSWORD	Encryption__PasswordEnvVar	Name of the env var that supplies the password. If non-empty at boot, it overrides Encryption:Password.
Encryption:Salt	string	""	Encryption__Salt	REQUIRED when Enabled = true. Base64-encoded PBKDF2 salt; must decode to at least 16 bytes. Salts are not secret. Changing the salt invalidates every prior envelope.
Encryption:Iterations	int	600000	Encryption__Iterations	PBKDF2-HMAC-SHA256 iteration count. Rejected below 10000.

danger

Password loss is unrecoverable — there is no server-side decrypt endpoint and no escrow. See Encryption.

Auth

Key	Type	Default	Env override	Notes
Auth:ApiKey	string	""	Auth__ApiKey	REQUIRED, SECRET. Static API key, minimum 16 characters. Sent in the X-API-Key header by programmatic clients; pasted at /login by operators to receive a cookie.
Auth:CookieName	string	lbs-auth	Auth__CookieName	Cookie name issued by /api/auth/login. SameSite=Strict, HttpOnly, secure when the request was HTTPS.
Auth:ApiKeyHeader	string	X-API-Key	Auth__ApiKeyHeader	HTTP header the API-key scheme reads. Rename only if a reverse-proxy convention forces it.

See Security for API-key rotation and cookie session lifetime.

Storage

Key	Type	Default	Env override	Notes
Storage:Root	string	data	Storage__Root	REQUIRED. Root under which processing/, output/, error/, db/, logs/ are created. Override per target — /var/lib/bulksigner on Linux, C:\ProgramData\Lacuna\BulkSigner\data on Windows, /var/lib/bulksigner in Docker.
Storage:Inputs[]	array of {Name, Path, IgnoredExtensions?, IgnoredPrefixes?, Profile?}	[{Name="default", Path="{Root}/input"}]	Storage__Inputs__0__Name, Storage__Inputs__0__Path, …	One or more watched input folders. Jobs are tagged with the folder's Name and resolved Profile. See below for validation rules.

Storage:Inputs[] — validation rules (enforced at startup)

• Name must match ^[a-z0-9](?:[a-z0-9-]{0,38}[a-z0-9])?$ and be unique across the list — lowercase letters, digits, and internal hyphens only, 1–40 characters, starting and ending with an alphanumeric. Names appear in URL query strings, metric labels, and the dashboard UI.
• Path must be non-empty and resolve to a directory that is not the same as and not a sub-/super-directory of any other entry's path. Overlapping folders would produce double-enqueues and ambiguous attribution.
• Soft cap: 16 entries. Higher counts inflate metric cardinality and the Input page beyond useful density.
• When Storage:Inputs is omitted entirely, the service creates one folder named default at {Storage:Root}/input.

Storage:Inputs[].IgnoredExtensions / Storage:Inputs[].IgnoredPrefixes (per-folder)

Optional arrays. The effective ignore list is the union of the global WatchedFolder:IgnoredExtensions / WatchedFolder:IgnoredPrefixes baseline and the per-folder additions. Per-folder lists add to the baseline; they cannot un-ignore something the global list already filters. Example: with the default baseline (.tmp, .part, .crdownload, .swp), a folder declaring IgnoredExtensions: [".bak"] filters .bak and .tmp etc.

Example: two folders, one with an extra ignore rule

"Storage": {
  "Root": "/var/lib/bulksigner",
  "Inputs": [
    { "Name": "default", "Path": "/var/lib/bulksigner/input" },
    {
      "Name": "legal",
      "Path": "/mnt/legal/incoming",
      "IgnoredExtensions": [".bak"]
    }
  ]
}

Pipeline

Key	Type	Default	Env override	Notes
Pipeline:PollIntervalSeconds	int	2	Pipeline__PollIntervalSeconds	How often the worker polls the queue when idle. Lower = faster pickup, more SQLite reads. Bounds: 1–3600.
Pipeline:MaxConcurrency	int	1	Pipeline__MaxConcurrency	Upper bound on concurrent in-flight jobs. Default 1 is sequential. Increase for throughput on PFX-backed deployments. Bounds: 1–32. PKCS#11 / WindowsStore: keep at 1 unless the token / CSP allows concurrent sessions — see Certificates.

WatchedFolder

The stability detector guards against picking up a file that is still being written — the watcher waits until size and last-write-time stay identical across StabilityRequiredSamples consecutive polls.

Key	Type	Default	Env override	Notes
WatchedFolder:StabilityPollIntervalMs	int	500	WatchedFolder__StabilityPollIntervalMs	Interval between stability checks. Bounds: 50–10000.
WatchedFolder:StabilityRequiredSamples	int	3	WatchedFolder__StabilityRequiredSamples	Consecutive identical samples needed before enqueue. Bounds: 1–100.
WatchedFolder:StabilityTimeoutSeconds	int	60	WatchedFolder__StabilityTimeoutSeconds	Maximum wait before giving up on a never-stable file. Bounds: 1–3600.
WatchedFolder:IgnoredExtensions	array	[".tmp", ".part", ".crdownload", ".swp"]	n/a (use config)	File extensions the watcher ignores entirely.
WatchedFolder:IgnoredPrefixes	array	[".", "~$"]	n/a (use config)	File-name prefixes the watcher ignores (dotfiles, Office lock files).

Upload

Key	Type	Default	Env override	Notes
Upload:MaxBytes	long	104857600 (100 MiB)	Upload__MaxBytes	Hard cap on the POST /api/files request body. Raise for scan-heavy PDFs. Minimum 1024.

Dashboard

Key	Type	Default	Env override	Notes
Dashboard:PollIntervalSeconds	int	5	Dashboard__PollIntervalSeconds	Server-side refresh tick for live dashboard pages. Bounds: 1–60.

LogViewer

Backs the in-memory recent-exception store and the /logs dashboard page. All values are read once at startup — change them and restart.

Key	Type	Default	Env override	Notes
LogViewer:Enabled	bool	true	LogViewer__Enabled	Master switch. When false the in-memory sink is not wired, the /logs page shows a disabled notice, and the nav link is hidden.
LogViewer:MaxEntries	int	20	LogViewer__MaxEntries	Size of the bounded in-memory buffer and the ceiling on rendered entries. Oldest entries are evicted past this limit. Bounds: 1–1000.
LogViewer:RefreshIntervalSeconds	int	5	LogViewer__RefreshIntervalSeconds	Automatic refresh tick for the /logs page. Bounds: 1–60. The page also has a manual refresh button.
LogViewer:Levels	string[]	["Error","Fatal"]	LogViewer__Levels__0, …	Log levels the store captures (case-insensitive). Valid names: Verbose, Debug, Information, Warning, Error, Fatal. Empty or unknown names fail startup. Logging:File:MinimumLevel still applies first — widening this below that minimum captures nothing, because those events never reach the sink.

See Dashboard.

Metrics

Key	Type	Default	Env override	Notes
Metrics:RequireApiKey	bool	true	Metrics__RequireApiKey	When true, /api/metrics requires API-key or cookie auth. Set false only if your Prometheus scraper sits inside the trust boundary and the network is locked down.

See REST API for the full inventory of metrics instruments.

Statistics

Key	Type	Default	Env override	Notes
Statistics:Enabled	bool	true	Statistics__Enabled	Master switch. When false the collector is a no-op (no recording, no locking) and the dashboard panel is hidden. Statistics are held only in process memory and reset on restart — they are never written to the database.

See Job statistics for what each number means.

Telemetry

Opt-in Azure Application Insights export. Off by default; when off, the service has no Application Insights dependency and makes no outbound calls on its behalf.

Key	Type	Default	Env override	Notes
Telemetry:Enabled	bool	false	Telemetry__Enabled	Master switch. When true, a connection string is required — startup fails without one.
Telemetry:ConnectionString	string?	null	Telemetry__ConnectionString	SECRET. Application Insights connection string. Leave unset to supply it via the standard APPLICATIONINSIGHTS_CONNECTION_STRING environment variable instead.
Telemetry:RoleName	string	Lacuna.BulkSigner	Telemetry__RoleName	Reported as the cloud_RoleName dimension, so several services sharing one resource stay distinguishable.

See Telemetry for what is collected and the KQL queries to read it.

RateLimiting

Per-IP fixed-window policies.

Key	Type	Default	Env override	Notes
RateLimiting:Enabled	bool	true	RateLimiting__Enabled	Master switch. Disable for closed-network installs.
RateLimiting:Upload:PermitsPerWindow	int	30	RateLimiting__Upload__PermitsPerWindow	Requests allowed per window for POST /api/files.
RateLimiting:Upload:WindowSeconds	int	60	RateLimiting__Upload__WindowSeconds	Window length for the upload policy.
RateLimiting:Upload:QueueLimit	int	0	RateLimiting__Upload__QueueLimit	How many over-limit requests wait vs. being rejected immediately. 0 = reject immediately.
RateLimiting:Actions:PermitsPerWindow	int	60	RateLimiting__Actions__PermitsPerWindow	Requests allowed per window for action endpoints (retry, cancel, rescan, cleanup, pause, resume).
RateLimiting:Actions:WindowSeconds	int	60	RateLimiting__Actions__WindowSeconds	Window length for the actions policy.
RateLimiting:Actions:QueueLimit	int	0	RateLimiting__Actions__QueueLimit	Queue depth for the actions policy.

Rate-limited responses carry code = "rate-limited" in the error envelope.

Hosting

Key	Type	Default	Env override	Notes
Hosting:RequireHttps	bool	false	Hosting__RequireHttps	Gates the in-process HTTPS redirect. false (default) for service and Docker installs that terminate TLS at a reverse proxy. Surfaced in the ready-summary banner as https redirect = on/off.

AllowedHosts

Key	Type	Default	Env override	Notes
AllowedHosts	string	*	AllowedHosts	Standard ASP.NET Core host filtering. Override to a comma-separated list if the install is reverse-proxied with a fixed external host name.

Environment variables that have no JSON counterpart

Variable	Purpose
BULK_SIGNER_CONFIG_DIR	Tells the binary where the production config lives when the binary is in a read-only install location. Set by the install scripts.
BULK_SIGNER_PKCS11_PIN	The HSM/token PIN — read at the env-var name configured by Signing:Certificate:Pkcs11:PinEnvVar.
BULK_SIGNER_ENCRYPTION_PASSWORD	PBKDF2 password — read at the env-var name configured by Encryption:PasswordEnvVar.
APPLICATIONINSIGHTS_CONNECTION_STRING	Standard Azure Monitor variable. Read directly by the exporter and honoured by the startup validator, so Telemetry:ConnectionString can be left unset. See Telemetry.
ASPNETCORE_ENVIRONMENT	Standard ASP.NET Core environment name (Development, Production). The install scripts set Production.
ASPNETCORE_URLS	Standard. The install scripts set http://0.0.0.0:8080.
ASPNETCORE_CONTENTROOT	Standard. The Windows install sets it to C:\ProgramData\Lacuna\BulkSigner so file-path resolution lands on operator-writable disk.

Verifying configuration at runtime

The ready-summary banner printed on startup lists the most decision-critical settings (host mode, environment, https redirect, content root, storage root, license fingerprint, cert source, signing policy, encryption status, poll interval, pipeline mode). A mistyped key surfaces there as a default value rather than the value you intended.

/api/ready returns a JSON body describing each probe (DB, input folder, license). A 503 with a body listing the failed probe is the fast feedback loop for config mistakes — see Troubleshooting.

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Next: Certificates — choosing and configuring a certificate source. Previous: Installation.