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I copied my private key to a file and I can't remember what the string begins with. Can you help me by giving me the different types of private key: number of characters and and with which characters the private keys start. This is a bitcoin key from 2011/2012.

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Ian's BIP39 site will show you an example of pretty much every coins private key format. Technically these are WIF encoded private keys, but I assume these are what you mean.

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[what are] the different types of private key: number of characters and and with which characters the private keys start.

I have this note from https://en.bitcoin.it/wiki/List_of_address_prefixes

Decimal prefix Hex Example use Leading symbol(s) Example
128 80 Private key (WIF, uncompressed pubkey) 5 5Hwgr3u458GLafKBgxtssHSPqJnYoGrSzgQsPwLFhLNYskDPyyA
128 80 Private key (WIF, compressed pubkey) K or L L1aW4aubDFB7yfras2S1mN3bqg9nwySY8nkoLmJebSLD5BWv3ENZ
4 136 173 228 0488ADE4 BIP32 private key xprv xprv9s21ZrQH143K24Mfq5zL5MhWK9hUhhGbd45hLXo2Pq2oqzMMo63o StZzF93Y5wvzdUayhgkkFoicQZcP3y52uPPxFnfoLZB21Teqt1VvEHx
239 EF Testnet Private key (WIF, uncompressed pubkey) 9 92Pg46rUhgTT7romnV7iGW6W1gbGdeezqdbJCzShkCsYNzyyNcc
239 EF Testnet Private key (WIF, compressed pubkey) c cNJFgo1driFnPcBdBX8BrJrpxchBWXwXCvNH5SoSkdcF6JXXwHMm
4 53 131 148 04358394 Testnet BIP32 private key tprv tprv8ZgxMBicQKsPcsbCVeqqF1KVdH7gwDJbxbzpCxDUsoXHdb6SnTPY xdwSAKDC6KKJzv7khnNWRAJQsRA8BBQyiSfYnRt6zuu4vZQGKjeW4YF
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  • The question is about private keys but only six rows in the answer refer to private keys.
    – Pranab
    Jul 27, 2022 at 7:54
  • @Pranab: Good point, others removed. Jul 27, 2022 at 9:16

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