Bounty campaigns are campaigns to promote the project on social media (Twitter, FB, Reddit, Linkedin, ..etc.) by bounty hunters, and there are many other different campaigns such as translation, content creation, Youtube Videos, and so on, and bounty hunters are paid at the end of the project’s tokens. As for signature campaigns, they are promoting the project in the forum by seasoned members here, according to rules that the signature campaign manager sets, and he must be a trusted and professional manager with a good reputation, and his account must contain positive trusts, and the participants in the signature campaign are paid in Bitcoin or any top currencies in the market, and my advice to you is if you are not ready to deal with the escrow service, as they reserve the bounty or the signature campaign tokens that will distribute at the end to the participants, do not think about launching them, and if your project is not 100% complete in development and complete in all aspects so take care of developing it first and finishing everything, before you think about promoting it through trusted bounty managers because you will usually find it difficult for them to accept your offer.