Wallets — Bitcoin

Partially redeeming a Casascius physical bitcoin - help request

Overview of problem
I have a Casascius physical bitcoin and I am unable to add its digital contents to a wallet. It seems that the key is not the right length or format. I started to get out of my depth with talk of things like a Minikey format.
I removed the hologram when I was given it years ago as I was curious what was under there. I don't want to sell it instead I want to add its 1 BTC value to a wallet so I can partially redeem it and keep the physical brass as a collectible.
What I have observed and tried (apologies in advance for butchering terms)
I've searched several sites, including here and haven't been able to find a current answer for the new style of keys and wallets.
I put the seven character code from the hologram into the casascius.uberbills dot com site and it gives me a 33 character key, tells me it's version 2 and confirms that it has a 1 BTC value
I've tried to import it into a Blockchain wallet but get the error "this private key does not match the watch only address above" when I enter the private key under the hologram. For some reason it seems like a different public address is generated when I enter the 33 char code.
I tried to import it into a Jaxx Liberty wallet but it doesn't recognise the minikey or 33 char code as valid.
I've basically run up against my level of knowledge and don't know what the next steps are of if I'm missing something bleeding obvious. I double and triple checked any data entry because I saw this was a common problem.
I'd really appreciate any help or pointers the community can give me.
Thanks
Edit:
Solution
I followed the advice given by u/murbul in reply to my post
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.
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
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.
I’m very happy.
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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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