Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.19+commit.c4cbbb05.js&optimize=false&gist=

ballot.sol

pragma solidity ^0.4.0;

contract Vaults {
    struct Deposit {
        bool isCreated;
        uint amount;
        uint takenInterest;
        uint depositBlock;
        uint releaseRequestBlock;
        address releaseTo;
        uint blocksPerInterest;
        uint interestFraction;
    }
    
    struct Vault {
        uint totalOwned;
        mapping(address => Deposit) deposits;
    }
    
    mapping(address => Vault) vaults;
    
    function Vaults() public { }
    
    function put(address vaultOwner, uint blocksPerInterest, uint interestFraction) public payable {
        Vault storage v = vaults[vaultOwner];
        // return if deposit already found
        if (v.deposits[msg.sender].isCreated){
            return;
        }
        Deposit memory deposit = Deposit({
            isCreated: true,
            amount: msg.value, 
            takenInterest: 0,
            depositBlock: now,
            releaseRequestBlock: 0,
            releaseTo: msg.sender,
            blocksPerInterest: blocksPerInterest,
            interestFraction: interestFraction
        });
        v.deposits[msg.sender] = deposit;
    }
    
    function requestRelease(address vaultOwner, address releaseTo) public {
        Vault storage v = vaults[vaultOwner];
        Deposit storage deposit = v.deposits[msg.sender];
        // return if deposit not found
        if (!deposit.isCreated) {
            return;
        }
        // return if already requested
        if (deposit.releaseRequestBlock != 0) {
            return;
        }
        deposit.releaseRequestBlock = now;
        deposit.releaseTo = releaseTo;
    }
    
    function release(address depositOwner) public {
        Vault storage v = vaults[msg.sender];
        Deposit storage deposit = v.deposits[depositOwner];
        // return if deposit not found
        if (!deposit.isCreated) {
            return;
        }
        // return if release not requested
        if (deposit.releaseRequestBlock == 0) {
            return;
        }
        deposit.isCreated = false;
        uint blocks = deposit.releaseRequestBlock - deposit.depositBlock;
        uint interestParts = blocks / deposit.blocksPerInterest;
        if (blocks % deposit.blocksPerInterest != 0) {
            interestParts++;
        }
        uint interest = deposit.amount * interestParts / deposit.interestFraction;
        if (interest > deposit.amount) {
            return;
        }
        uint remain = deposit.amount - interest;
        if (v.totalOwned < remain) {
            return;
        }
        deposit.releaseTo.transfer(remain);
        v.totalOwned -= remain;
    }
}