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There are a few trade-offs and key points to keep in mind in this area. Any decision that a user makes which affects the outcome gives that user an unfair advantage. Examples include: Using a blockhash, timestamp, or other miner-defined value. Keep in mind that the miner has a choice of whether to publish a block or not, so they could conceivably have one chance at the prize per block they mine. A

From what I have researched, it seems that all of the methods for allowing a user to signup and login for an Ethereum dapp are very cumbersome for the user to use. What are the best practices to allow signup and login that match the following criteria: The method for signup and login should not be cumbersome; ie: simple as normal methods of username/password or facebook and google oauth. The metho

Here are some simple and useful patterns in increasing order of utility. Event logs are omitted for brevity. In practice, it's desirable to emit events for every important state change. Simple List Using Array Strengths Reliably chronological order Provides a count Random access by Row Number (not Id) Weaknesses No random access by Id No assurance of uniqueness No check for duplicates Uncontrolled