At what price the first investors bought KEEP for?
According to Messari, Industrial Staker Sale (Series A Tranche) in 2017: $0.0720 per KEEP and Staker Sale (Series B Tranche) in 2019: $0.120 per KEEP.
What is tBTC?
tBTC is a tokenised BTC to bring BTC in the Etherum space. Check tBTC.
tBTC vs TBTC? Why do youkeepchanging the spelling?
The system, in its entirety, is called "tBTC". The fungible Bitcoin-backed token is called "TBTC" to distinguish it from the rest of the project. This approach is also reflected in the Ethereum ERC-20 token contract. Further discussion can be found in the relevant Github issue.
You can earn KEEP by creating and maintaining a node (Random Beacon and/or ECDSA). More information in the Staking section.
How much KEEP can I earn?
You earn KEEP through fees and 200,000,000 KEEPs (20% of the token supply) will be distributed through the stakedrop. How much you will earn will depend on the amount of KEEP and/or ETH you stake and how much other people will stake. More information in Stakedrop.
Over 2 years, the minimum amount to stake is lowered periodically using a uniform stepwise function, starting at 100k KEEP and eventually ending at 10k KEEP. See How do we stake? for the detailed schedule.