Do you know that there are some crypto coins that are doing airdrops to owners of Bitcoin? This means that if you are holding BTC in a wallet that allows you to sign messages (local or online one) you can get free money in the form of crypto coins. Below are some of these coins that send to you an amount of their tokens based on how much Bitcoin you have in your wallet, there could be some more, so if you know of some other one that is missing please point to it in the comments below. A word of warning though, you need to be careful with such coins and more specifically what they ask you for in the form of confirmation you are the owner of a given BTC wallet. Signing a message or doing a micro transaction from a Bitcoin wallet is fine as confirmation, but if they ask for a private key or wallet file or some sensitive data like that, then just avoid them!
Bitcore made a Snapshot of the Bitcoin Network at Blockheight 463604 and captured every Wallet with a Balance bigger than 0.01 BTC, all wallets containing BTC at that point can claim free BTX coins by signing a message from your wallet (exchanges are not supported). Furthermore after you claim your free coins if your wallet has at least 10 BTX you will receive a 3% bonus payment on a weekly basis.
With Bytecall for every 16 BTC you receive 1 GB (1 gigabyte = 1 billion bytes), furthermore for every 5 GB you receive additional 1 GB. To prove your Bitcoin wallet balances you need to install the Byteball wallet and chat with the Transition Bot (you find it in the Bot Store in the wallet). The bot will help you link your Bitcoin and Byteball addresses by making a micropayment or signing a message. The next (8th) airdrop round is scheduled for the full moon of August (Aug 7, 2017 at 18:10 UTC).
Stellar Lumens (XLM)
The current round of XLM giveaway will be for up to 16 BILLION Lumens to Bitcoin holders or 16% of the initial Lumens. On June 27th, 2017 the next airdrop of Lumens will be made available to any Bitcoin holder who wants them, including those that received Lumens during the first giveaway round. Lumens will be available for exchanges that support the giveaway as well as for users with their own Bitcoin wallets. The snapshot of the Bitcoin blockchain will be taken on June 26, 2017 and the Lumen distribution will be held on the next day with 974.957961 XLM per Bitcoin owned in wallet. Participating exchanges for the moment include: Kraken, BTC38, Deribit, Yuanbao, NaoBTC and Bit-Z.