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Can I import a 256 bit private key in a Wallet (binary format)?
Or do I have to convert it in another format?
dumpprivkey in bitcoin core returns private key in WIF
importprivkey adds a private key (as returned by dumpprivkey) to your wallet.
Private key to WIF: https://bitcoin.stackexchange.com/a/99101/
Most wallets (and by that, I mean almost all) will not accept a binary 256 bit private key, you will have to convert your 1's and 0's to a WIF format.
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