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Bitcoin Core uses a hierarchical deterministic (HD) wallet structure by default (since version 0.13). The wallet.dat file contains:
Mostly users with very old, unnamed wallet.dat files (typically from before version 0.21) who have "pruning" enabled or use custom wallet directories. bitcoin core walletdat upd
When you start the new client, it will automatically attempt to read your wallet.dat . If your file is in the legacy Berkeley DB format, Bitcoin Core will initiate a migration process to convert it to a descriptor wallet. Bitcoin Core uses a hierarchical deterministic (HD) wallet
bitcoin-qt -salvagewallet
Use the migratewallet command in the Bitcoin Core Console : bitcoin-cli -rpcwallet="your_wallet_name" migratewallet If your file is in the legacy Berkeley
This guide provides a deep dive into what the wallet.dat file is, why updating it is crucial, and—most importantly—how to perform a without errors, corruption, or loss of funds.