As of my last knowledge update in September 2021, I don't have specific information about a website or platform called "ledger.com." However, based on the name, it's possible that "www.ledger.com start" could refer to a website or service related to financial management, accounting, or blockchain technology.
If "ledger.com" has gained prominence or significance after September 2021, I recommend visiting the website directly or searching for recent online resources to get accurate and up-to-date information about what the platform offers and its purpose.
Please note that my information might be outdated, and I suggest verifying any information I provide with current and reliable sources.