Simple contract for testing signing message, deployed on Rinkeby network 0xB654B936eFF42C9f2cABD8B4cd0DF3c50Bf07A2A

1. Create your party data with format : [idParty (int), owner party address (address), party name(string)]
2. Convert party data to hash, you can use getMessageHash function
3. Signing hash message, if you use Remix, you can use signing feature https://prnt.sc/15vg84q
4. When signing complete, you will get the signature, copy the signature and split in Remix Console using command ethers.utils.splitSignature({the signature}). Output example https://prnt.sc/15vh1h0
5. Prepare you signature data with format: [v (int256) , r (byte32), s (byte32)]
6. Create your party using createParty function.