This tool runs entirely offline. It never sends your keys, mnemonic, or shares anywhere. It holds secrets in memory only and zeroes them on lock, on dispose, and on page unload. Verify the Conformance panel passes before trusting any output. For high-value seeds, use a dedicated air-gapped machine.
Decode Extended Key
Decoded Structure
Version
Classification
Network
Depth
Parent fingerprint
Child number
Hardened
Base58Check
Chain code (32 bytes hex)
Key material (33 bytes hex)
Private key scalar (hex, 32 bytes)
Public key compressed (33 bytes hex)
Fingerprint (Hash160 of pubkey, first 4 bytes)
Full Hash160
Derived Child
Path
Child extended key (serialized)
Child chain code
Child key material
Child fingerprint
BIP85 Child-Seed Generator
BIP85 Output
Path
Derived key (child private key)
Derived entropy (64 bytes hex, truncated to application length)