How To Securely Participate in our CTB Token Sale

Our Token Sale will be a straight forward one but the difference is, we give you more viable options for contribbing. If not, please follow these instructions:

To participate in the token sale you need an Ethereum wallet or an application where you hold the private keys. Private keys are needed to correctly interact with smart contract functions, like transferring tokens.

*We only accept Ether and USD. If you hold Bitcoin or other ERC20 Tokens.

Trusted Source

Do not use any Ethereum address information posted on Social Media channels, even if they appear to be from CONTRIB (that includes not using information on any translated version of our site or posts). For security reasons the only trusted source for the Ethereum address to contribute ETH in the Token Sale will be available through:

Ethereum Wallet

Do not send Ether directly from Cryptocurrency exchanges such as Coinbase or Kraken. You need a ERC20 Token compatible Ethereum Wallet (see below).

Participating in the token sale

  1. Buy ether in a cryptocurrency exchange. (
  2. Transfer Ether to a compatible wallet (see below).
  3. Send the Ether to our token sale address with correct data and gas limit values

Sending a Token Sale transaction

Token sale deposit transactions need to have non-default gas limit (a.k.a. transaction maximum gas). This is because token sale transactions are more complex than simple Ethereum transfer transactions. The default gas limits is too low to correctly perform a token sale deposit.

To participate an Ethereum token sale you need to fill your transaction with following details

  • TXN Address — this is given to you on the Contrib purchase token tab. For security reasons the only trusted source for the Ethereum address to contribute ETH in the Token Sale will be available through:
  • Gas limit: Please raise to 21000 or the minimum gas which tells you that this is a smart contract transaction and is definitely more expensive than normal Ether transfer.
  • Gas Price: Leave at 50 gwei or whatever is the minimum. Do not go above 50 or the transaction will be rejected.

Note: If you are using please double check your gas limit field value after filling the data field. MyEtherWallet may reset the gas value to an invalid number after inputting the data field.

Compatible wallets

The following wallets are known to be compatible with Ethereum tokens (ERC-20 standard):


  • Do not send any ETH from an exchange. Always send ETH to your own wallet first, and then contribute from there.
  • If you don’t know which wallet to use we recommend
  • Use only the Token Sale Address provided athttps://crypto.contrib.comNot even email. No other source is valid.
  • Select a Gas Limit of 21000 or more.


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