Claimdrop Contract V2

The Claimdrop Contract V2 is a smart contract designed to distribute tokens to a list of addresses in a secure and efficient manner. Based on V1, this contract's implementation differs by a few factors, such as using a batch upload mechanism to add a list of allocations, with addresses and their corresponding token amounts.

Features

• Batch upload allocations. Batch upload can only be done before the campaign starts, afterwards, the feature is disabled.

• Lump sum and/or linear vesting distribution. Two distribution types are supported simultaneously. For instance one could be a lump sum distribution and the other could be a linear vesting distribution.

• Only one campaign per contract. If there's an error with the current campaign, the owner can close the campaign, retrieving all the unclaimed tokens back. It's possible to get a snapshot of all the tokens claimed up to that point with the Claimed query, then create a new contract/campaign with the right data.

• The owner is the only one who can create campaigns.

• Anyone can top up the campaign by sending funds to the contract by using a BankMsg.

• The owner can close the campaign at any point before the campaign ends. When a campaign is ended, the owner will receive the remaining, unclaimed tokens in the campaign.

• Only a single claim entry per address is allowed.

• Addresses are added as strings, in case there are users entitled to claim but still haven't bridged from Ethereum to MANTRA, a placeholder can be used for those addresses.

• Ability to replace an address in the allocation's registry. When this occurs, the claims performed by the "old" wallet are attached to the new address, same as the original allocation entry. The entries for the old wallet are removed.

• Ability to remove an address from the allocation list.

• Coin agnostic, any native coin is supported.

• Ability to blacklist addresses (in case of hacked for instance). Blacklisted wallets cannot claim.

• The owner (of the contract) is the only one able to do all permissioned actions, i.e. create a campaign, close a campaign, blacklist users, batch upload addresses.

• Ability to make partial claims.

How it works

The Claimdrop Contract V2 is meant to host a single airdrop campaign per contract. When instantiating the contract, an owner can be specified. Only the owner can:

• Create a new campaign.

• Batch upload allocations.

• Blacklist an address.

• Replace or remove an address from allocation list.

• Close campaign, retriving the remaining funds in the contract.

If there's a mistake on the token distribution, i.e. the airdrop data was incorrect, the owner can remove the addresses that were incorrect and add the right allocations with another message.

Instantiate

Instantiates an instance of the claimdrop contract.

{
  "owner": "mantra1..."
}

Key	Type	Description
owner	Option<String>	The owner of the contract. If none is provided, the address instantiating the contract becomes the owner.

ExecuteMsg

ManageCampaign

Manages a campaign based on the action, which can be:

• CreateCampaign: Creates a new airdrop campaign, making sure all params are correct. Only the contract owner can perform this action.

• CloseCampaign: Closes the campaign. The remaining unclaimed funds are returned to the owner of the campaign. Only the contract owner can perform this action.

Once created, the campaign is stored in the CAMPAIGN item.

CreateCampaign

{
  "manage_campaign": {
    "action": {
      "create_campaign": {
        "params": {
          "name": "Airdrop",
          "description": "This is an airdrop description.",
          "reward_denom": "uom",
          "total_reward": {
            "denom": "uom",
            "amount": "888888888888"
          },
          "distribution_type": [
            {
              "lump_sum": {
                "percentage": "0.25",
                "start_time": 1571797419
              }
            },
            {
              "linear_vesting": {
                "percentage": "0.75",
                "start_time": 1572402219,
                "end_time": 1573007019,
                "cliff_duration": 86400
              }
            }
          ],
          "start_time": 1571797419,
          "end_time": 1573007019
        }
      }
    }
  }
}

Key	Type	Description
name	String	The name of the campaign. The name cannot be empty nor above 200 chars in length.
description	String	The description of the campaign. The description cannot be empty nor above 2000 chars in length.
reward_denom	String	The denom to be distributed as reward by the campaign.
total_reward	Coin	The total amount of the reward asset that is intended to be allocated to the campaign.
distribution_type	Vec<DistributionType>	The distribution types. It can be two at most, and it can be a combination of LumpSum and LinearVesting. The percentage of both distributions needs to be equal to 100%, and their start time needs to be in the future.
start_time	u64	The campaign start time (unix timestamp), in seconds.
end_time	u64	The campaign end timestamp (unix timestamp), in seconds.

Note: the total_reward must be sent with this transaction.

CloseCampaign

{
  "manage_campaign": {
    "action": {
      "close_campaign": {}
    }
  }
}

Note: Can't close a campaign which has already been closed.

Claim

Claims rewards from a campaign.

{
  "claim": {
    "receiver": "mantra1...",
    "amount": "88888"
  }
}

Key	Type	Description
receiver	Option<String>	The receiver address of the claimed rewards. If not set, the sender of the message will be the receiver. This is useful for allowing a contract to do the claim operation on behalf of a user.
amount	Option<Uint128>	The amount to claim. If not set, all available tokens will be claimed.

AddAllocations

Adds a batch of addresses and their allocations. This can only be done by the owner before the campaign has started.

{
  "add_allocations": {
    "allocations": [
      [
        "mantra1...",
        "100000"
      ],
      [
        "mantra1...",
        "200000"
      ]
    ]
  }
}

Key	Type	Description
allocations	Vec<(String, Uint128)>	Vector of (address, amount) pairs.

ReplaceAddress

Replaces an address in the allocation list. This can be done at any time by the owner.

{
  "replace_address": {
    "old_address": "mantra1...",
    "new_address": "mantra1..."
  }
}

Key	Type	Description
old_address	String	The old address to replace.
new_address	String	The new address to use.

RemoveAddress

Removes an address from the allocation list. This can only be done by the owner before the campaign has started.

{
  "remove_address": {
    "address": "mantra1..."
  }
}

Key	Type	Description
address	String	The address to remove.

BlacklistAddress

Blacklists or unblacklists an address. This can be done at any time by the owner.

{
  "blacklist_address": {
    "address": "mantra1...",
    "blacklist": true
  }
}

Key	Type	Description
address	String	The address to blacklist/unblacklist.
blacklist	bool	Whether to blacklist or unblacklist.

UpdateOwnership(::cw_ownable::Action)

Implements cw_ownable. Updates the contract's ownership. ::cw_ownable::Action can be TransferOwnership,AcceptOwnership and RenounceOwnership.

Note: This is a cw_ownable message.

TransferOwnership

Propose to transfer the contract's ownership to another account, optionally with an expiry time. Can only be called by the contract's current owner. Any existing pending ownership transfer is overwritten.

{
  "update_ownership": {
    "transfer_ownership": {
      "new_owner": "mantra1...",
      "expiry": {
        "at_height": "424242424242"
      }
    }
  }
}

Key	Type	Description
new_owner	String	The new owner proposed,
expiry	Option<Expiration>	Optional expiration time parameter.

AcceptOwnership

Accept the pending ownership transfer. Can only be called by the pending owner.

{
  "update_ownership": {
    "accept_ownership": {}
  }
}

RenounceOwnership

Give up the contract's ownership and the possibility of appointing a new owner. Can only be invoked by the contract's current owner. Any existing pending ownership transfer is canceled.

{
  "update_ownership": {
    "renounce_ownership": {}
  }
}

QueryMsg

Campaign

Get the airdrop campaign.

Query

{
  "campaign": {}
}

Response (CampaignResponse)

{
  "name": "Airdrop title",
  "description": "Airdrop description",
  "reward_denom": "uom",
  "total_reward": {
    "denom": "uom",
    "amount": "888888888888"
  },
  "claimed": {
    "denom": "uom",
    "amount": "8888"
  },
  "distribution_type": [
    {
      "lump_sum": {
        "percentage": "0.25",
        "start_time": 1571797419
      }
    },
    {
      "linear_vesting": {
        "percentage": "0.75",
        "start_time": 1572402219,
        "end_time": 1573007019,
        "cliff_duration": 86400
      }
    }
  ],
  "start_time": 1571797419,
  "end_time": 1573007019,
  "closed": 1573008019
}

Key	Type	Description
name	String	The name of the campaign. The name cannot be empty nor above 200 chars in length.
description	String	The description of the campaign. The description cannot be empty nor above 2000 chars in length.
reward_denom	String	The denom to be distributed as reward by the campaign.
total_reward	Coin	The total amount of the reward asset that is intended to be allocated to the campaign.
claimed	Coin	The amount of the reward asset that has been claimed.
distribution_type	Vec<DistributionType>	The distribution types. It can be two at most, and it can be a combination of LumpSum and LinearVesting. The percentage of both distributions needs to be equal to 100%, and their start time needs to be in the future.
start_time	u64	The campaign start time (unix timestamp), in seconds.
end_time	u64	The campaign end timestamp (unix timestamp), in seconds.
closed	Option<u64>	The timestamp at which the campaign was closed, in seconds.

Rewards

Get the rewards for a specific campaign and receiver address.

Query

{
  "rewards": {
    "receiver": "mantra1..."
  }
}

Key	Type	Description
receiver	String	The address to get the rewards for.

Response (RewardsResponse)

{
  "claimed": [
    {
      "denom": "uom",
      "amount": "888"
    }
  ],
  "pending": [
    {
      "denom": "uom",
      "amount": "8000"
    }
  ],
  "available_to_claim": [
    {
      "denom": "uom",
      "amount": "1000"
    }
  ]
}

Key	Type	Description
claimed	Vec<Coin>	The tokens that have been claimed by the address.
pending	Vec<Coin>	The total amount of tokens that is pending to be claimed by the address.
available_to_claim	Vec<Coin>	The tokens that are available to be claimed by the address.

Claimed

Get the total amount of tokens claimed on the campaign.

Query

{
  "claimed": {
    "address": "mantra1...",
    "start_from": "mantra1...",
    "limit": 50
  }
}

Key	Type	Description
address	Option<String>	If provided, it will return the tokens claimed by the specified address.
start_from	Option<String>	If provided, the address to start querying from. Used for paginating results.
limit	Option<u16>	The maximum number of items to return. If not set, the default value is used. Used for paginating results.

Response (ClaimedResponse)

{
  "claimed": [
    [
      "mantra1...",
      {
        "denom": "uom",
        "amount": "1000"
      }
    ],
    [
      "mantra1...",
      {
        "denom": "uom",
        "amount": "8888"
      }
    ]
  ]
}

Key	Type	Description
claimed	Vec<(String, Coin)>	Contains a vector with a tuple with (address, coin) that have been claimed

Allocations

Get the allocation for an address.

Query

{
  "allocations": {
    "address": "mantra1...",
    "start_after": "mantra1...",
    "limit": 50
  }
}

Key	Type	Description
address	Option<String>	If provided, it will return the allocation for the specified address.
start_after	Option<String>	If provided, the address to start querying from. Used for paginating results.
limit	Option<u16>	The maximum number of items to return. If not set, the default value is used. Used for paginating results.

Response (AllocationsResponse)

{
  "allocations": [
    [
      "mantra1...",
      "100000"
    ],
    [
      "mantra1...",
      "200000"
    ]
  ]
}

Key	Type	Description
allocations	Vec<(String, Uint128)>	Contains a vector with a tuple with (address, amount) that have been allocated

IsBlacklisted

Check if an address is blacklisted.

Query

{
  "is_blacklisted": {
    "address": "mantra1..."
  }
}

Key	Type	Description
address	String	The address to check for.

Response (BlacklistResponse)

{
  "is_blacklisted": true
}

Key	Type	Description
is_blacklisted	bool	Whether the address is blacklisted.