Thx for your suggestions so far!
Scan to an image
Scanning your signature is something I also did years ago, works great for simple low level stuff. And it’s also legal in most countries.
Currently I also have my signature legalised at three different notaries, in three different countries for stuff that requires a legalised signature. I even have copies of original legalised digital versions of that, my lawyers also have those copies (has already been proven useful several times, setting up new businesses, larger contracts etc). Works great but can be quite expensive.
Now, for me there is something between the lower level signatures and the heavy notary/lawyer documents. Things that (might) have a great (financial) impact, but currently are not that valuable. For example simpler contracts. To use a lawyer or notary for those would simply be to costly.
My main concern is that I want to exclude the situation where someone said I agreed to a contract and shows my digital signature (scanned image) on that document where I I never even seen that contract, or it’s slightly changed by the other party etc.
Ok, call me paranoid, but that happened to me twice already.
Adobe eSign services
@mswehli thx for the Echosign suggestion! Looks promising. It’s now rebranded to Adobe eSign services, but $14.99/month seems a bit to much for my use case. Besides that I don’t really like the vendor lock-in Adobe tries to create.
Today I’ve made some successful tests with digitally signing PDF documents using my PGP key. So if somebody copies my digital signature (scanned image) they can not created a PGP signed version of that document, since they would need me cryptographic private key for that. In that case I can ask the other party, show me the PGP publicly signed version. If they can’t reproduce that, we’re done. I don’t know how that holds up in court, but is sounds reasonable.
I’ll share my findings about this and how to set it up in a blog post!
Any other suggestions?