[dsteinman]

> Login management should be built into the browsers instead.

I would go even further than this, and say that a cryptocurrency might be among the best ways to build a universal login system. Imagine an Ethereum-like coin where the wallet is the username, and you spend the coins while authenticating, gaining privileges, and the blockchain stores your public info like a username and avatar that you can bring to any website.

[IgorPartola]

I don’t want every login to become a part of the public ledger. Do you? Also, crypto currencies are a good solution for one thing only: electronic currencies. Outside of that they are a poorer solution compared to what’s available now. Every time.

[whatl3y]

> crypto currencies are a good solution for one thing only: electronic currencies.

What is a better solution than building a tamper proof workflow in the blockchain? Examples include:

1. I sign a contract and the notary signs and uploads a copy to the blockchain to validate the contract contents, that it was signed and by whom, and when.

2. An auditor validates a piece of evidence a client provides that proves its in compliance with a particular control in some regulatory framework. The auditor uploads a SHA256 hash of the evidence in a transaction memo to the blockchain to validate against later in peer review, a lawsuit, etc.

Edit: My examples here refer to a valid use case of a blockchain and not cryptocurrencies which is what you mention, but based on context of this discussion it looks like we all actually mean blockchain and not necessarily cryptocurrency.