September 23–30, 2019: $50 Signup Bonus Special Offer
BlockFi (referral link) provides the BlockFi Interest Account, which allows you to earn 6.2% APY on your Bitcoin and Ethereum deposits. BlockFi has a referral program that rewards the referrer for interest earned in the BlockFi Interest Account as well as loans.
The rate of 6.2% APY applies to Bitcoin deposits between 1 and 25 BTC, and Ethereum deposits between 25 and 500 ETH.
BlockFi (referral link) provides the BlockFi Interest Account which pays interest on crypto deposits. I received a promotion which provides you and the referrer with $50 worth of bitcoin each as bonus for signing up between September 23, 2019 and September 30, 2019.
To receive the offer, simply sign up with this referral link and make your first deposit before September 30, 2019. Make sure the referral code of 4a5cfc70 is entered when you are signing up.
It looks like the bonus will be paid out with the October interest payment. These are the promotion terms I received from BlockFi:
Offer valid until 11:59 PM UTC on September 30, 2019. Referrals must have had a balance of 0 on August 31, 2019 and must maintain a >0 balance through September 30, 2019. Referrals must be first-time BlockFi users that have never had a balance with BlockFi.
If you start tackling cryptocurrency puzzles on a regular basis, especially ones that are multiple puzzles in a series, you’ll soon find yourself dividing your attention between multiple puzzles and needing to keep track of what’s active. I started this tracker to help me keep track of the puzzles in one place and hopefully it’s useful to others as well.
Updated daily or more often on a best effort basis. If you see something out of date, please leave a comment.
I love cryptocurrency puzzles. Since April 2019, I have solved thirteen puzzles, winning over $1,500. I challenge puzzles of various kinds, including those related to knowledge, cryptography, brain teasers, hacking, and scavenger hunts. The race against other people to find a hidden private key that unlocks a crypto treasure is a unique thrill.
In my upcoming “Solving Puzzles” series of posts, I hope to document some of the fun and excitement in solving cryptocurrency-related puzzles, and share some of my secrets to help people tackle future puzzles and collect that prize money!
If you’re interested in starting on some puzzles now, I keep a handy list of the ones I’m aware of in my Ongoing Puzzles Tracker.
If you have a cryptocurrency wallet, whether hardware (Trezor, Ledger) or software (Electrum), you may have generated a 12 or 24 word mnemonic phrase. This phrase must be kept secure because it is effectively the key to all of the funds stored in your wallet. Anyone with access to this recovery seed can access and transfer your funds, unless you have a 25th word passphrase, in which case they would require that too.
With this in mind, this is a non-comprehensive list of things not to do with your recovery seed if you want to keep your wallet secure.
Celsius (referral link) has increased its interest rate for Bitcoin from 5.1% to 6.4%, which now beats the rate of 6.2% from BlockFi (referral link). Note that though both rates quoted are annual interest rates, the BlockFi rate is compounding while the Celsius interest rate only accrues on the principal. This may matter to you if you plan on keeping your balance deposited for extended periods of time (more than a year, for example).
If you are thinking that you may be able to just withdraw the entire balance from Celsius and redeposit it to earn interest on the entire balance, beware that someone on Reddit claims that Celsius “remembers” your past interest balance and prevents this. Let me know in the comments if you have validated whether this is the case.
May 20, 2019 Update: Celsius rate decreased from 6.4% to 4.5%, check out Highest Interest Bitcoin Accounts for up-to-date rates
You can deposit your BTC and earn interest with these “savings accounts” for Bitcoin.
Links to providers may be referral links.
| Provider | Rate (APY) | Compounding |
| Celsius | 4.5% | None |
| BlockFi | 6.2% | Monthly |
April 30, 2019 Update: Celsius rate increased from 5.1% to 6.4%
May 20, 2019 Update: Celsius rate decreased from 6.4% to 4.5%
Celsius (referral link) allows you to make cryptocurrency deposits and earn interest from the balance. Celsius has a great referral program that rewards both the referrer and the referred person with up to $20 in BTC.
The Celsius account earns up to 7.5% in annual interest for balances of Bitcoin, Ethereum, Litecoin, Ripple, OmiseGO, Bitcoin Cash, 0x, Bitcoin Gold, ZCash, Stellar, Dash, and a variety of stablecoins including TrueUSD, Gemini Dollar, Paxos, USD Coin, and Dai from MakerDAO.
Coinbase (referral link) makes it easy to buy or sell cryptocurrency by bank transfer or using a debit card. Coinbase has a referral program that rewards both parties with $10 of bitcoin when the referred person buys or sells at least $100 worth of cryptocurrency.
On Coinbase, you can buy and sell Bitcoin, Bitcoin Cash, Ethereum, Ethereum Classic, Litecoin, 0x, USD Coin, Basic Attention Token, Zcash, XRP, and Stellar Lumens.
In most cases, it is advisable to update your Trezor to the latest firmware. However, in a few select cases, it might make sense to try to access your Trezor while it is running an older firmware and move all funds off of the device.
However, if you try to access your old Trezor without upgrading, you’ll quickly get stuck. Read on to find out how to get unstuck and access your funds quickly.
