What is a Bitcoin Transaction ? What is the best and safest Bitcoin wallet?

What is a Bitcoin Transaction ? What is the best and safest Bitcoin wallet?
The DigitalBank propose the banks a very attractive legal solution to enter the Cryptocurrency field , while increasing their revenues and customer base , at zero costs . The DigitalBank solved forever the Cryptocurrency custodianship issue .
The DigitalBank (DB) : the Fort Knox of Bitcoin Storage . DigitalBank is a totally secured Vault for the Bitcoin and Crypto Investors .
Easy and Simple Interface for operating your account : zero technical skills needed .The DigitalBank is in your own hands , nothing stored by third parties.
The DigitalBank Crypto Vault is an ultra-secure software and hardware wallet that supports over 500 cryptocurrencies. Its breakthrough is in the signing of transactions without storing any private keys – making it , the most secured crypto wallet available and  bringing true security to crypto finance.
DB is The First and Only Decentralized Anonymous E-Banking System in the World .
The DigitalBank Vault Device eliminates permanently, any possibility of phishing attacks or corrupt software .
Worldwide Ultra Secured Access 24/7 .
DigitalBank Is Securing the  Lifetime Access to account holders .
Immediate Crypto to Fiat Conversions and viceversa