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storage-protocol

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The DeNet Storage Protocol offers a scalable and decentralized solution for data storage. It uses Proof of Storage technology, allowing nodes to reach consensus and validate storage without requiring 100% uptime. The protocol consists of storage nodes and the ProofOfStorage validation algorithm, ensuring efficient and reliable storage operations.

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# Storage Protocol

Storage Protocol made by DeNet Team.

[![Build Status](https://github.com/denetpro/storage-protocol/workflows/CI/badge.svg)](https://github.com/denetpro/storage-protocol/actions)
[![Coverage Status](https://coveralls.io/repos/github/denetpro/storage-protocol/badge.svg?branch=to-deploy)](https://coveralls.io/github/denetpro/storage-protocol/?branch=to-deploy)

## WIP: Contract Strorage

Contract Storage available by address: [0xf1EFEd8F60b10B897A474E0470FE038bb2D2F1fa](https://polygonscan.com/address/0xf1EFEd8F60b10B897A474E0470FE038bb2D2F1fa) on polygon network.

Storage protocol consists of two dependent applications - storage node, and ProofOfStorage validation algorithm.. The ProofOfStorage contract is the core feature that allows you to build decentralized storage on top of any EVM.

## Main features of PoS contract

Proof-of-Storage contract helps nodes and clients achieve consensus and auto-scalability without 100% uptime from client side. But the node must always be online.

- No protocol fees
- No scaling limit
- No need to create your own blockchain
- No system-requirements for creating proof 
- Works with any EVM-compatible blockchain
- Support any ERC20 tokens for payments
- Gas limit of one proof lower than usual token swap

## Deploy Notes

**v3.0.2 Node NFT**
- Added whitelist
- Updated limit algo into proofs

**v3.0.2 Payments**
- Removed "Automigration"
- Removing "token" address from getBalance
- Removing "token" address from localTransferFrom
- maxDepositPerUser updated from 1 USDC to 100 USDC (need to fix later)
- fixes with require error text

**v3.0.2 PoS**
- Added user_storage_size for payments
- Added user_storage_size for user storage
- Updates Signatures from User
- Solidity Version upgrade ^0.8.0 > 0.8.9 in PoS
- AutoTest Updated
- Last Block Proof changed to Last Proof Timestamp
- Support old payments version in PoS
- IsValidSign replaced into ECDSA from PoS
- removed "IPayments" from getUserRewardInfo 
- Added minimal proofrange
- Added code comments
- Added base_difficulty changing via sending proofs
- Added debug mode (to disable check of user signature) (will depricated in v4 or later)
- AutoDifficulty fix

**v0.2.0 Payments**
- Bug fix
- GasToken Creation
- AutoMigration from old versions

**v0.2.0 PoS**
- Added Node NFT
- Added new version of Payments contract

**v0.1.0**
- First ProofOfStorage Contract

## Deploy Contract History

Name|Network|Address|Updated|Status
|---|---|---|---|---|
|NodeNFT|Kovan|[`0x805F977832959F39Cd7C2D9cDf5B30cE5A560d16`](https://kovan.etherscan.io/address/0x805F977832959F39Cd7C2D9cDf5B30cE5A560d16)|2021-12-21|V3.0.2
|ProofOfStorage|Kovan|[`0x721F6078C009453bFdfa702f05aD54df7900B0eA`](https://kovan.etherscan.io/address/0x721F6078C009453bFdfa702f05aD54df7900B0eA)|2021-12-20|V3.0.2
|UserStorage|Kovan|[`0x721F6078C009453bFdfa702f05aD54df7900B0eA`](https://kovan.etherscan.io/address/0x0dC0B02e6763fC4f57176A6813d7B100C169AcC1)|2021-12-20|V3.0.2
|Payments V2| Kovan|[`0x0dC0B02e6763fC4f57176A6813d7B100C169AcC1`](https://kovan.etherscan.io/address0x98329d51486C0A942fCb3fAE5A0a18E05708cdc0)|2021-09-09|V0.3.0
|Reward|Kovan|[`0x7708A1Bd5C36e6f57C39c089575163662B35Ea94`](https://kovan.etherscan.io)|2021-09-15|V0.3.0
|UserStorage|Kovan|[`0x6C5eb19854A80037C7E911128CFF13E81841A40F`](https://kovan.etherscan.io/address/0x6C5eb19854A80037C7E911128CFF13E81841A40F)|2021-05-26|V0.1.0
|Payments|Kovan|[`0xA260B0aD50fB996cEffa614bAb75846E06991622`](https://kovan.etherscan.io/address/0xA260B0aD50fB996cEffa614bAb75846E06991622)|2021-07-02|V0.1.0
ProofOfStorage|Kovan|[`0x2E8630780A231E8bCf12Ba1172bEB9055deEBF8B`](https://kovan.etherscan.io/address/0x2E8630780A231E8bCf12Ba1172bEB9055deEBF8B)|2021-05-22|V0.1.0
|DFILE Token|Kovan|[`0x0d3C95079Ff0B4cf055a65EF4b63BbB047456848`](https://kovan.etherscan.io/address/0x0d3C95079Ff0B4cf055a65EF4b63BbB047456848)|2021-05-21|V0.1.0

## Problem description:

Consensus algorithm requirements:

- Minimum system requirements
- Minimum blockchain using
- Infinity scalability 
- Decentralized 
- Zero Knowledge Proofs (no sending full file for proof, or no using third-party)
- Proving files without any metadata storing in blockchain
- The complexity of the security of your own blockchain

## Step By Step proof creation and validation:

Node operate and provide storage proofs without third-party:

1. Load MerkleTree from user **FS**
2. Select any file from user **FS**
3. Make **proof** for selected file and one of 100 latest blocks
4. Verify **proof** % **base_diff** < selected user difficulty
5. Send proof to Smart Contract to get rewarded

Where:

- **user FS** - User filesystem merkle tree of selected user.
- **proof** - f(MerkleTree8kb, RHFS, nonce, digsig) (returns sha256(node address + file + blockhash)
- **user_difficulty** - (selected block number).sub(last proof block number for this user)
- **base_diff** - Constanta or dynamically updatable number
- **reward** - min((1/365 x days from last proof), 7) x deposited amount

More about PoS will available [in docs](/docs/digital%20paper.pdf)

### Smart contracts:

1. ProofOfStorage

Main contract for getting rewarded by ProofOfStorage

Available methods:

- makeDeposit (deposit reward for storage)
    - closeDeposit (withdraw rewards)
    - sendProof (Send proof from node)
    - sendProofFrom (Send proof for other node)
    - getUserRewardInfo (Returns info about user reward for ProofOfStorage)
    - getUserRootHash (get last uploaded user root hash)

2. Payments

Contract for make local transfers for rewarding PoS actions

Available methods:

- localTransferFrom (call from PoS if valid proof)
    - depositToLocal (deposit funds from other token, call from PoS if deposit)
    - closeDeposit (withdraw funds, call from PoS if closing deposit)

3. User Storage

Contract for storing the last version of storage root hash and emit data about updater for nodes updated.

Available methods:

- updateRootHash (call from PoS, if updated user root hash from valid proof or signature)
    - updateLastBlockNumber (call from PoS, if valid proof)
    - setUserPlan (call from PoS, if updated Token for payments)

### Schema

![image](https://user-images.githubusercontent.com/9944728/130633580-071a0333-bb7b-4381-b8fc-6d386cb4154a.png)

## Benchmarks

**Est Gas Amount to send proof**

|Part Size|Gas|TX|Save on blockchain|
|---|---|---|---|
|8kb|163,969 gas|[Kovan Testnet](https://kovan.etherscan.io/tx/0xeeac74efd55becef0c70d4f0e599d37c43a848bcf2fbd6527f356e1e21282607)|No|
|16kb|300,038 gas|[Kovan Testnet](https://kovan.etherscan.io/tx/0xf48703c458954ba0e4609f18dce721a24a003db68565a9f354472e4edf687113)|No|
|16kb|10,581,008 gas|[Kovan Testnet](https://kovan.etherscan.io/tx/0xcdca6a4c3b8db736a4c75925255423bdffeddd4b12c38f3e68caa5b083c8f7fe)|Yes|

![image](https://user-images.githubusercontent.com/9944728/130641639-c150d81b-2090-4945-8949-82a2d8a5ffaf.png)

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