I have my 12 word passphrase and would like to see the contents of my wallet how do I see this wallet on a new app or site?
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Unfortunately, there is no mnemonic phrase standard that is completely unanimously adopted. (Although BIP39 seems to be the most widely accepted in my view) That's saying, different wallets may produce different types of mnemonic phrases that won't be compatible with each other. Please recall which walllet did you use, and, what did the receiving addresses look like (starting with "1" or "3" or "bc1"?). Of course, these words are your own top secret, never share it to anybody, anyone who knows them will be able to stole your funds.– Chris ChenCommented Dec 13, 2019 at 8:08
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If you don't care about your privacy, you can always find the associated extended public key (xpub*) and enter it in a blockchain explorer site such as https://www.blockchain.com/explorer.
Here is how a Bitcoin account's (M/44'/0'/0'/) extended public key for a given set of 12 seed words can be computed on a trusted air gapped offline computer that could be operating in a Faraday cage:
% echo "radar blur cabbage chef fix engine embark joy scheme fiction master release" | bx mnemonic-to-seed | bx hd-new | bx hd-private -d -i 44 | bx hd-private -d -i 0 | bx hd-public -d -i 0
xpub6DHi64TFkDPx2AH4q2ku3vX9LJYNpTis5tLrET8Sb9irp174eCkgtAnvBpyzQXgrtmF31Lrq4gTMGFUGcjJicMu9LdueVdqt6FZ2Wzcg8Fj
Ledger and Trezor devices can be queried to gain access to your xpub key.
Otherwise, just apply the KISS principle and use your wallet application that will naturally provide you with an account balance.
