The whole story is the following:

I contacted Jonathan Leonard on the 21st October 2014 who is the founder of Cryptolator physical bitcoins and he sent me this email:

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Hi !
(Je ne sais pas si tu parles français alors je vais écrire en anglais / I dont know if you speak french so I’ll write it in english )

I’ll make you coins tomorrow, I was wondering if you prefer Multi-Signature or Single-Signature ?

Multi-Signature is a bit more complex to redeem, they are safer since you have a secret password on your side and I put the second under the hologram. You need to create a certificate on your side (Using a link I provide) and when you want to redeem it, you either do it with the Bitcoin-QT or through my website.

If you chose this option here is the link for creating your passphrase or password and public key that you will give me (You give me only the public key, not the password)

You need to keep the passphrase since it will be needed to print your own certificate and will be needed when you want to redeem.

https://dashboard.cryptolator.com/#generate

Single-Signature is the same as Casascius and Lealana, one secret code under the hologram and you can redeem it almost anywhere easily.

So, as soon as I have your response, I’ll create the coin and ship it to you at the latest Wednesday !

Thanks !

Jonathan


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So after this communication I asked him to prepare 4 coins with multi signature wallets.

I followed the link in his email above in order to generate the certificate which I have with my passphrase/password along with the public key which I supplied to him.  The public key is a long hexadecimal which starts with 04d*** and ends with ***d1 and has another 135 characters in between.

I supposed he used the public key in some way to generate the second passphrase which I uncovered yesterday under the hologram which I peeled off.

(his website is no longer active by the way)

I wish I had opted for the single signature wallets...

Is this any clearer for you?

Thanks again for any advice