![]() If an attacker is able to modify your block database files, then they can do all sorts of evil things which could cause you to lose bitcoins. Bitcoin Core treats its block database files as 100% accurate and trustworthy, whereas during the normal initial sync it treats each block offered by a peer as invalid until proven otherwise. However, when you copy someone's database in this way, you are trusting them absolutely. This is usually far faster than doing the normal initial sync over again. In other words, if you copy installation A's block database into installation B, installation B will then have the same syncing percentage as installation A. These files, known collectively as a node's "block database", represent all of the information downloaded by a node during the syncing process. The database files in the "blocks" and "chainstate" directories are cross-platform, and can be copied between different installations. Other files and folders (blocks, blocks/index, chainstate) may be safely transferred/archived as they contain information pertaining only to the public blockchain.
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January 2023
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