You might struggle to find a wallet that natively supports MINI keys these days since it's an old format that never really took off apart from Casascius coins. So your best bet is to use a tool to convert it to a real private key (starting with 5) and import/sweep that into a wallet.I used the site and one of the keys generated was one starting with '5' (Private Key WIF). I used this in Jaxx Liberty in the 'Paper Wallet Import' function under tools and it came right across.
You can convert it on the Wallet Details tab of https://www.bitaddress.org/ - For 1 BTC I'd be paranoid enough to recommend downloading the source and doing everything offline: https://github.com/pointbiz/bitaddress.org
This keeps things consistent with the way Bitcoin is implemented now. For example, a 21-byte Base58Check-encoded string where the first byte is 0x00 is safely assumed to be a Bitcoin address. Two elements are reliably consistent: the 0x00 byte, and the 21-byte total length. Generates Bitcoin addresses, converts between hex/address and public/private keys. - casascius/Bitcoin-Address-Utility Physical Bitcoins by Casascius are gold plated coins with the Bitcoin logo minted on them. They come in both 1 BTC and 25 BTC face values. Casascius Casascius Series 1 holograms use a 22-character variant of the minikey format, instead of 30 characters. Everything is the same other than the length. To properly implement minikey redemption, services and clients must support the 30-character format, but may optionally support the 22-character format as well to allow redemption of old Casascius coins. Use of the 22-character format for future ... Resource: A common tool to create and redeem these keys is the Casascius Bitcoin Address Utility. Public Key Formats¶ Bitcoin ECDSA public keys represent a point on a particular Elliptic Curve (EC) defined in secp256k1. In their traditional uncompressed form, public keys contain an identification byte, a 32-byte X coordinate, and a 32-byte Y coordinate. The extremely simplified illustration ...
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