Ethereum 5

• How to send token transactions without Ether?
• What ERC-standards and smart contracts are supported?
• How to make a custom call to a smart contract? (non-standard)
• How to get Ether on ropsten?
• Transaction is hashed but never broadcasted to the blockchain

Bitcoin 4

• Do Bitcoin wallets support SegWit?
• How to read the xpub
• How is the fee calculated and paid?
• Is there a way to anticipate the exact mining fee before sending the transaction?