Written contracts are unfortunately of little value here. The collateral is the contract. So if you have an acceptable one and enough to cover the loan value plus interest, then you might stand a chance of actually getting a loan.

As for the 1 to 2 years, this will of course affect the value of the collateral you need. I guess it would be principal plus the total interest.

Passports, ID, contracts and IOU messages will not work. You need liquidable digital or tangible assets which should be transferable to the lender in their totality. Recoverable online assets such as domains might not work if they can be re-accessed or reset in your favor after the initial transfer.

I recommend offering stable listed altcoins.

Edit.. just read your response above. Yes, those are nice collateral but they need to be appraised and assayed first to the satisfaction of the lender. And they also need to be physically transferred to either the lender or an acceptable escrow.