Last year I won a hackathon contest with a large group including only one other dev. After the contest we decided to keep working on the project. For a couple of months I played a central role developing the fundamental product concept, business strategy, legal approach, and the coding itself. Periodically I raised concerns that we still hadn't formalised equity share. My concerns were dismissed.
I discovered two of the non-devs had applied to accelerators without asking the team, despite me making it clear that in my opinion we didn't need outside investment. I handed over my work-in-progress and emailed the team saying I was moving to the "advisor tier" which the two had previously described as coming with "a small share of equity", and received positive replies from them. Since then I've been contacted by the other dev for assistance (he'd never heard of node.js - let alone the rest of the tech).
Less than a month later they asked to meet to give me a "token of [their] appreciation". They then ambushed me with an IP transfer agreement and told me that in their opinion I deserved no equity. I didn't sign it.
I contacted them explaining that if they wanted to buy me out, and retrospectively change our relationship, I would expect to be paid for the consultancy I'd provided, and quoted a fair fee. After 7 weeks I've chased them a few times and received a single request to meet in person (I declined as I want written records of all exchanges). The core two and the other dev have since enrolled in an accelerator - and therefore presumably lied about owning the full IP when they gave them equity.
What are my options?
1. Run, don't walk, to the copyright office and register. It costs $35, you can do it online, and if you do it in time it puts you in a better negotiating position. I'm not going to walk through the legal situation here, just do it. Your lawyer will thank you.
2. If you think owning the IP was a provision of the accelerator deal, you could probably brick the deal by writing to the accelerator yourself and pointing out that you own the IP. I wouldn't do that without a lawyer's ok, but I would definitely make a threat as one software engineer to another to the founders that it's within your power to contact the accelerator and see if the cofounders blink.
3. Is the IP being used by them right now? And how is it being used? There are potentially some strategies there but I would need more details. If you don't want to share that information here then lawyer up.