IdeaRegistry.sol

pragma solidity ^0.4.24;

contract IdeaRegistry {
  struct Idea {
    address owner;
    uint[] links;
  }

  mapping(uint => Idea) registry;

  function registerIdea(uint ideaHash, uint[] links) public {
    require(registry[ideaHash].owner == address(0));
    registry[ideaHash] = Idea(msg.sender, links);
  }

   function getIdea(uint ideaId) public view returns(uint[]) {
      return registry[ideaId].links;
  }
}