Tools

T.00 · Classic

Wallet Generator

Generate BTC, ETH, and SOL wallets completely offline — with seed, path, and self-custody explanation.

BIP39offline

Open generator → T.01

ETH Unit Converter

Wei ↔ Gwei ↔ Ether — exact BigInt math, with deep links like ?value=21&unit=gwei.

WeiGweiEther

Open converter → T.02

Address Validator

Checks Bitcoin (bech32, bech32m/Taproot, legacy), EVM addresses (EIP-55) and Solana (Base58, 32 bytes) — with explanations.

bech32EIP-55Solana

Open validator → T.03

QR Code Generator

Enter a BTC, ETH or SOL address and generate a QR code — fully client-side, with download.

QRAddressoffline

Open generator → T.04

Web3 Glossary

54 terms in 3 sentences each — from seed to nonce, with search and links to tools and guides.

SeedNonceUTXO

Open glossary → T.05

Seed Phrase Validator

Check BIP39 words and validate the checksum offline — without generating keys.

BIP39Checksumoffline

Open validator → T.06

Self-Custody Checklist

15 points from purchase to worst cases - checkable, with progress, printable as paper plan.

BackupHardware15 points

Open checklist → T.07

Self-Custody Quiz

6 questions in 3 minutes — test your crypto habits, completely local in your browser.

Quiz6 questionsoffline

Start quiz → T.08

Message Verifier

Verify EIP-191 signatures — who owns this statement? Verify only, no private key.

EIP-191Signatureoffline

Open verifier → T.09

Transaction Decoder

Read raw hex — type, nonce, gas, recipient, value and signature. Legacy, type 1, type 2.

RLPEIP-1559offline

Open decoder → T.10

Vanity Generator

Grind a Solana address with desired prefix — offline, with live speed and time estimate.

VanitySolanaoffline

Open generator → T.11

Seed Security

12 or 24 words? Entropy and crack time for any attacker rate — calculated live.

BIP39Entropyoffline

Open calculator → T.12

ABI Decoder

Paste an ABI or signature, decode raw calldata — function, selector and parameters, readable.

ABICalldataoffline

Open decoder →

Start here

Bitcoin & Web3 Basics

The learning path through all nine articles in this section — with a progress tracker, in three modules: wallets, transactions, addresses.

Learning pathBeginner

Read guide → W.01

How a wallet actually works

From seed phrase to derivation paths to address — the full path explained.

SeedBIP32Address

Read guide → W.02

Why addresses need checksums

How bech32, Base58Check and EIP-55 catch typos before money is lost.

EIP-55bech32Checksum

Read guide → W.03

UTXO vs. account model

Why Bitcoin works with “coins with change” and Ethereum with account balances.

UTXOAccountBitcoin

Read guide → W.04

What is a nonce?

Ethereum's transaction counter: why a gap blocks all following transactions.

NonceEthereumTransaction

Read guide → W.05

Why Ether has 18 decimals

Gas economics on Ethereum: Wei, Gwei and why the smallest units matter.

GasGweiEthereum

Read guide → W.06

Why QR codes belong to crypto

Offline bridge for addresses — and the quishing trap: always verify after scanning.

QR codeOfflineQuishing

Read guide → W.07

Why vanity addresses work

Grind math, entropy calculation and the privacy catch — what they are good for.

VanityEntropySolana

Read guide → W.08

Using a hardware wallet right

Buy, set up offline, seed on steel, test recovery — plus the 5 mistakes that undo everything.

Hardware walletSetupBackup

Read guide → W.09

How safe is your seed: 12 or 24 words?

128 vs. 256 bits of randomness — what that means in years, and what no word count protects against.

EntropyBIP39Brute force

Read guide →