Ledger Lab

BTCMobick lab

Practice transaction structure, txid checks, unit conversion, fees, address scripts, hashes, and fork boundaries without wallet permissions.

Read-only lookupThe browser never connects directly to Electrum TCP or asks for signing authority.

4 current-mainnet recordsThe same current-mainnet header evidence is used on the source page.

Source-backed searchLessons, explanations, and public statements are handled with source status.

Beginner flow

Send/receive practice

Separate receiving address, UTXO inputs, outputs, fees, change, and txid without broadcasting.

Ledger lookup

Check the 64-character txid shape before comparing explorer and read-only lookup results.

Unit tool

Convert BMB and bick, then estimate fee size as a percentage of the amount.

Fee tool

Estimate vB and bick fees by input type, input count, output count, and fee rate.

Address tool

Read address type, scriptPubKey, and Electrum scripthash as public information.

Hash tool

Compare how small message changes produce different digests.

Fork tool

Keep the Bitcoin parent block, legacy migration record, and current mainnet start separate.

Source search

Search lessons and claims without treating context as verified fact.