Validate XNO Address

Validates XNO (Nano) cryptocurrency addresses offline. No network connection required - all validation is local.

Address Format

Nano account addresses follow this format:

nano_<60 chars>   (65 total)
xrb_<60 chars>    (64 total, legacy prefix)

Components

Part	Description	Length
Prefix	nano_ (current) or xrb_ (legacy)	5 or 4 chars
Account	Base32 encoded public key + checksum	60 chars
Checksum	Blake2b hash verification (last 8 chars of account)	8 chars

Valid Prefixes

• nano_ - Current standard format (recommended)
• xrb_ - Legacy format (deprecated but still valid)

Character Set

Addresses use Nano’s Base32 alphabet:

13456789abcdefghijkmnopqrstuwxyz

CLI Validation

npx xno-skills validate <address>

Or via QR generation (also validates):

npx xno-skills qr <address>

Checksum Verification

The last 8 characters of a Nano address are a checksum:

1. Take the 32-byte public key
2. Compute Blake2b hash (5 bytes)
3. Reverse the bytes
4. Encode in Base32

This ensures any typo in the address will be detected.

Examples

Valid Addresses

nano_1pu7p5n3ghq1i1p4rhmek41f5add1uh34xpb94nkbxe8g4a6x1p69emk8y1d
nano_3phqgrqbso99xojkb1bijmfryo7dy1k38ep1o3k3yrhb7rqu1h1k47yu78gz
xrb_1pu7p5n3ghq1i1p4rhmek41f5add1uh34xpb94nkbxe8g4a6x1p69emk8y1d

Invalid Addresses

Address	Reason
nano_abc	Too short
nano_12345... (wrong chars)	Contains 0 or uppercase
btc_1xrb...	Wrong prefix
nano_1xrb... (69 chars)	Wrong total length
nano_1xrb... (bad checksum)	Checksum mismatch

Validation Steps

1. Check prefix - Must be nano_ or xrb_
2. Check length - Total 65 chars (nano_) or 64 chars (xrb_)
3. Check characters - Valid Base32 alphabet only
4. Verify checksum - Blake2b hash matches last 8 chars

Offline Validation

All validation is performed locally:

• No API calls
• No network requests
• No rate limits
• Works in air-gapped environments

Error Messages

Error	Meaning
Invalid prefix	Address doesn't start with nano_ or xrb_
Invalid length	Address is not 65/64 characters
Invalid Base32 character	Contains characters outside Nano’s Base32 alphabet
Invalid address padding bits	Address is not in canonical Nano Base32 form
Invalid checksum	Checksum doesn't match the public key

When to Use

• Before sending XNO to verify recipient address
• When displaying addresses in UI
• During wallet import/recovery
• In scripts that process addresses