Are Bitcoin Block Hashes Predictable?

Is there an incentive in Bitcoin mining to take fewer transactions into a block?

  • Related: is there a guarantee that every valid transaction ultimately makes it into a block?

  • Answer:

    1. A possible incentive would be if this simplifies the design of the mining hardware. I don't believe this to be the case, and I don't think any ASIC manufacturer would mass produce such hardware that won't include transactions, for the simple reason that this goes against the purpose of Bitcoin, and thus won't see a lot of demand. 2. There are no guarantees, but in practice every transaction that pays the recommended fees will get into a block pretty soon. At some point in the future the room for tx in blocks might run out, and the fee structure might have to change to support it. See this recent discussion about it: https://bitcointalk.org/index.php?topic=144895.0

Ron Gross at Quora Visit the source

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