I made a bitcoin payment donation to Elastic. Now, to redeem my Elastic coins, I need to sign the address on Blockchain. However, for some reason, Blockchain is showing that address as 'watch only'. I can't use it to sign. I need the private key for that address which I don't have because Blockchain no longer displays paper wallets or QR code for the key. I have no idea what to do? Any idea how I can redeem without signing or find my private key on Blockchain. Any advice would be much appreciated.