New stale block for Bitcoin

New stale block for Bitcoin

This morning a new stale block was registered on the Bitcoin blockchain.

This is the block 650491 , mined twice, first by BTC.com at 09:34:18 , while the second from an anonymous miner at 09:34:24.

They are two different blocks, mined by different miners, but with the same height, i.e. the same block number (650491).

Of these, the first, mined only six seconds earlier, is the one with the greatest length, that is, with several subsequent blocks linked together, so it prevailed over the other, which is only one in length.

In other words, the miners chose the first block to concatenate it to the following blocks, making obsolete the second block mined with the same number.

The one that has become part of the main chain contains 2,813 transactions, and weighs 1,274,070 bytes, obviously with 6.25 BTC as a premium, and 0.87 BTC as a fee.

The stale blocks on the Bitcoin chain

Since mining is a competition, all miners proceed on their own. Therefore, it may happen that two different miners come to mine the same block within a very short time distance from each other.

When this happens, the blocks are usually different, as the miners choose which transactions to place in them, but they share the same height, i.e. the same block number.

However, since in the chain there cannot exist two blocks with the same number , one of the two is then chosen to concatenate the subsequent blocks, while the other is abandoned.

From a strictly technical point of view this is a real fork, but with one of the two branches that stops immediately , and is thus discarded by the nodes.

In fact, there was no double spending, because the second block did not have a sequel and was abandoned.

Stale blocks are not very rare events, since for example already in March if he checked another, but they are still quite rare.

Furthermore usually do not cause problems , precisely because the miners who mine the following blocks they prefer the longer branches to which to chain the new blocks. This means that as soon as a subsequent one is added to a stale block, the miners begin to select the longest branch, abandoning the other.

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