Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- EVMFS
- Optimization enabled
- true
- Compiler version
- v0.8.28+commit.7893614a
- Optimization runs
- 200
- EVM Version
- prague
- Verified at
- 2026-03-10T21:51:45.398439Z
Constructor Arguments
0x000000000000000000000000d3a75ce3ce12a0aaa74e18e82a1714a21e7d7a13000000000000000000000000b4ac16cb7d97d200e1b474f985c367d8e870e72e000000000000000000000000de984be08167cc4b47ce70be71b18cbe95d986ce
Arg [0] (address) : 0xd3a75ce3ce12a0aaa74e18e82a1714a21e7d7a13
Arg [1] (address) : 0xb4ac16cb7d97d200e1b474f985c367d8e870e72e
Arg [2] (address) : 0xde984be08167cc4b47ce70be71b18cbe95d986ce
contracts/EVMFS.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
import "./Block.sol";
import "./IEVMFSSubscription.sol";
/**
* @notice EVMFS – stores ZIP archives on-chain as linked Block chunks.
*
* CID = rolling sha256 computed over successive chunks:
* hash_1 = sha256(chunk_1)
* hash_N = sha256(hash_{N-1} ++ chunk_N)
*
* The final hash is stored as a 32-byte CID (compatible with the
* evmfs-web-loader JS ABI: getFileByCID(bytes) / getFileBlocks()).
*
* Features:
* - Implicit resumability: getUploadProgress() returns block count + status
* so clients can resume interrupted uploads from the right offset.
* - Block reuse: addExistingBlock() allows composing files from blocks that
* were already uploaded (e.g. appending to a log without re-uploading
* existing content). Different files can share blocks, resulting in
* different CIDs that reference overlapping block sets.
* - Subscription tokenomics: holders of an active EVMFSSubscription NFT
* upload for free; non-subscribers pay a small per-block premium
* forwarded to the immutable beneficiary. Fully permissionless.
*/
contract EVMFS {
enum Status {
Uploading, // 0
Ready // 1
}
struct FileData {
uint256 id;
Status status;
bytes cid;
uint256[] blockIds;
}
Block public blockContract;
IEVMFSSubscription public immutable subscription;
address public immutable beneficiary;
uint256 public constant BLOCK_WRITE_PREMIUM = 0.00005 ether;
mapping(uint256 => FileData) private _files;
/// @dev keyed by the raw bytes32 CID
mapping(bytes32 => uint256) private _cidToFileId;
mapping(uint256 => bytes32) private _incrementalHash;
mapping(uint256 => address) private _fileOwners;
uint256 private _fileCount;
event FileCreated(uint256 indexed fileId, address indexed owner);
event BlockUploaded(uint256 indexed fileId, uint256 indexed blockId);
event FileFinalized(uint256 indexed fileId, bytes cid);
event FileExtended(uint256 indexed fileId, address indexed owner);
error FileNotFound();
error FileAlreadyFinalized();
error NotFileOwner();
error InvalidCID();
error EmptyData();
error BlockNotFound();
error FileNotFinalized();
error InsufficientPremium();
error PremiumTransferFailed();
constructor(address _blockContract, address _subscription, address _beneficiary) {
blockContract = Block(_blockContract);
subscription = IEVMFSSubscription(_subscription);
beneficiary = _beneficiary;
}
// ─────────────────────────────────────────────────────
// Write
// ─────────────────────────────────────────────────────
/**
* @notice Start a new file upload with the first chunk of data.
* @param data First (or only) chunk bytes. Must not be empty.
* @param end True when this is also the last chunk.
* @return fileId The new file ID.
*/
function createFile(bytes calldata data, bool end) external payable returns (uint256 fileId) {
if (data.length == 0) revert EmptyData();
_chargePremium();
fileId = ++_fileCount;
_files[fileId].id = fileId;
_files[fileId].status = Status.Uploading;
_fileOwners[fileId] = msg.sender;
emit FileCreated(fileId, msg.sender);
uint256 blockId = blockContract.createBlock(data);
_files[fileId].blockIds.push(blockId);
_incrementalHash[fileId] = sha256(data);
emit BlockUploaded(fileId, blockId);
if (end) _finalize(fileId);
}
/**
* @notice Append a new chunk to an in-progress upload.
* @param fileId The file ID returned by createFile().
* @param data Chunk bytes.
* @param end True when this is the last chunk.
* @return blockId The block ID of this chunk.
*/
function upload(uint256 fileId, bytes calldata data, bool end) external payable returns (uint256 blockId) {
if (fileId == 0 || fileId > _fileCount) revert FileNotFound();
if (_fileOwners[fileId] != msg.sender) revert NotFileOwner();
if (_files[fileId].status == Status.Ready) revert FileAlreadyFinalized();
_chargePremium();
blockId = blockContract.createBlock(data);
_files[fileId].blockIds.push(blockId);
_incrementalHash[fileId] = sha256(abi.encodePacked(_incrementalHash[fileId], data));
emit BlockUploaded(fileId, blockId);
if (end) _finalize(fileId);
}
/**
* @notice Reference an existing block (already uploaded) instead of uploading
* new data. Useful for composing files from overlapping block sets —
* e.g. appending new content to an existing log without re-uploading
* the unchanged prefix.
* @param fileId The file being assembled (must be in Uploading status).
* @param blockId An existing block ID (from this or any other file).
* @param end True to finalize the file after adding this block.
*/
function addExistingBlock(uint256 fileId, uint256 blockId, bool end) external {
if (fileId == 0 || fileId > _fileCount) revert FileNotFound();
if (_fileOwners[fileId] != msg.sender) revert NotFileOwner();
if (_files[fileId].status == Status.Ready) revert FileAlreadyFinalized();
// Read the block data for CID computation (reverts if block doesn't exist)
Block.BlockData memory blk = blockContract.getBlock(blockId);
_files[fileId].blockIds.push(blockId);
// Update rolling hash the same way as upload() — the CID depends on
// data content, not on whether the block was freshly created or reused.
if (_files[fileId].blockIds.length == 1) {
// First block added (file was created with createFileEmpty or similar)
_incrementalHash[fileId] = sha256(blk.data);
} else {
_incrementalHash[fileId] = sha256(abi.encodePacked(_incrementalHash[fileId], blk.data));
}
emit BlockUploaded(fileId, blockId);
if (end) _finalize(fileId);
}
/**
* @notice Create an empty file placeholder (no first chunk).
* Use with addExistingBlock() to compose files entirely from
* pre-existing blocks.
* @return fileId The new file ID.
*/
function createFileEmpty() external returns (uint256 fileId) {
fileId = ++_fileCount;
_files[fileId].id = fileId;
_files[fileId].status = Status.Uploading;
_fileOwners[fileId] = msg.sender;
emit FileCreated(fileId, msg.sender);
}
/**
* @notice Reopen a finalized file for appending.
* Sets status back to Uploading and re-seeds the incremental hash
* from the existing CID so subsequent upload() / addExistingBlock()
* calls continue the rolling hash. After appending, finalize again
* (pass end=true) to get a new CID.
* @param fileId The file to extend (must be Ready and owned by caller).
*/
function extendFile(uint256 fileId) external {
if (fileId == 0 || fileId > _fileCount) revert FileNotFound();
if (_fileOwners[fileId] != msg.sender) revert NotFileOwner();
if (_files[fileId].status != Status.Ready) revert FileNotFinalized();
// Remove old CID → fileId mapping (CID will change after new blocks)
bytes32 oldHash;
bytes memory oldCid = _files[fileId].cid;
assembly {
oldHash := mload(add(oldCid, 32))
}
delete _cidToFileId[oldHash];
// Re-seed incremental hash from the existing CID and set back to Uploading
_incrementalHash[fileId] = oldHash;
_files[fileId].status = Status.Uploading;
delete _files[fileId].cid;
emit FileExtended(fileId, msg.sender);
}
// ─────────────────────────────────────────────────────
// Read (ABI-compatible with evmfs-web-loader.js)
// ─────────────────────────────────────────────────────
/**
* @notice Look up a file by its 32-byte CID (raw sha256 bytes).
* @param cid Exactly 32 bytes (the sha256 hash used as CID).
*/
function getFileByCID(bytes calldata cid) external view returns (FileData memory) {
if (cid.length != 32) revert InvalidCID();
bytes32 key;
assembly {
key := calldataload(cid.offset)
}
uint256 fileId = _cidToFileId[key];
if (fileId == 0) revert FileNotFound();
return _files[fileId];
}
/**
* @notice Return all block payloads for a finalized file.
* @dev Return type matches the loader's ABI: tuple(uint256 id, bytes data)[].
*/
function getFileBlocks(uint256 fileId) external view returns (Block.BlockData[] memory blocks) {
if (fileId == 0 || fileId > _fileCount) revert FileNotFound();
uint256[] storage ids = _files[fileId].blockIds;
blocks = new Block.BlockData[](ids.length);
for (uint256 i; i < ids.length; ++i) {
blocks[i] = blockContract.getBlock(ids[i]);
}
}
/**
* @notice Query upload progress for implicit resumability.
* Clients can call this after a failed/interrupted upload to
* determine how many blocks were already committed, then resume
* by calling upload() / addExistingBlock() from that offset.
* @param fileId The file ID to query.
* @return status Current file status (Uploading or Ready).
* @return blockCount Number of blocks already committed.
* @return fileOwner Address that owns this file upload.
*/
function getUploadProgress(uint256 fileId) external view returns (
Status status,
uint256 blockCount,
address fileOwner
) {
if (fileId == 0 || fileId > _fileCount) revert FileNotFound();
return (
_files[fileId].status,
_files[fileId].blockIds.length,
_fileOwners[fileId]
);
}
/// @notice Total number of files created (including in-progress uploads).
function fileCount() external view returns (uint256) {
return _fileCount;
}
// ─────────────────────────────────────────────────────
// Internal
// ─────────────────────────────────────────────────────
/**
* @dev Charge the per-block premium if the caller has no active subscription.
* Subscribers pass through for free. Non-subscribers must attach at least
* BLOCK_WRITE_PREMIUM; the premium is forwarded to the beneficiary and
* any excess is refunded.
*/
function _chargePremium() internal {
if (subscription.hasActiveSubscription(msg.sender)) return;
if (msg.value < BLOCK_WRITE_PREMIUM) revert InsufficientPremium();
(bool ok, ) = beneficiary.call{value: BLOCK_WRITE_PREMIUM}("");
if (!ok) revert PremiumTransferFailed();
uint256 excess = msg.value - BLOCK_WRITE_PREMIUM;
if (excess > 0) {
(bool refundOk, ) = msg.sender.call{value: excess}("");
if (!refundOk) revert PremiumTransferFailed();
}
}
function _finalize(uint256 fileId) internal {
bytes32 hash = _incrementalHash[fileId];
_files[fileId].cid = abi.encodePacked(hash);
_files[fileId].status = Status.Ready;
_cidToFileId[hash] = fileId;
delete _incrementalHash[fileId];
emit FileFinalized(fileId, _files[fileId].cid);
}
}
contracts/Block.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
/// @notice Dead-simple chunk store. Each block holds up to CHUNK_SIZE bytes.
contract Block {
struct BlockData {
uint256 id;
bytes data;
}
mapping(uint256 => bytes) private _blocks;
uint256 private _blockCount;
event BlockCreated(uint256 indexed blockId);
function createBlock(bytes calldata data) external returns (uint256 blockId) {
blockId = ++_blockCount;
_blocks[blockId] = data;
emit BlockCreated(blockId);
}
function getBlock(uint256 blockId) external view returns (BlockData memory) {
require(blockId > 0 && blockId <= _blockCount, "Block: not found");
return BlockData(blockId, _blocks[blockId]);
}
function getBlockCount() external view returns (uint256) {
return _blockCount;
}
}
contracts/IEVMFSSubscription.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
/// @title IEVMFSSubscription — minimal interface for EVMFS premium checks
/// @notice EVMFS.sol queries this to decide whether to charge the block-write premium.
interface IEVMFSSubscription {
/// @notice Returns true if `account` has an active (non-expired) subscription.
function hasActiveSubscription(address account) external view returns (bool);
/// @notice Returns the expiry timestamp for `account`.
/// 0 = never subscribed, type(uint256).max = lifetime.
function subscriptionExpiry(address account) external view returns (uint256);
}
Compiler Settings
{"viaIR":true,"remappings":["@openzeppelin/contracts/=../../lib/openzeppelin-contracts/contracts/","forge-std/=../../lib/forge-std/src/","erc4626-tests/=/Users/Onix.Martinez/BlockProjects/web3-twitter/new_monorepo/lib/openzeppelin-contracts/lib/erc4626-tests/","halmos-cheatcodes/=/Users/Onix.Martinez/BlockProjects/web3-twitter/new_monorepo/lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/","openzeppelin-contracts/=/Users/Onix.Martinez/BlockProjects/web3-twitter/new_monorepo/lib/openzeppelin-contracts/contracts/"],"outputSelection":{"*":{"*":["*"],"":["*"]}},"optimizer":{"runs":200,"enabled":true},"metadata":{"useLiteralContent":false,"bytecodeHash":"ipfs","appendCBOR":true},"libraries":{},"evmVersion":"prague"}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_blockContract","internalType":"address"},{"type":"address","name":"_subscription","internalType":"address"},{"type":"address","name":"_beneficiary","internalType":"address"}]},{"type":"error","name":"BlockNotFound","inputs":[]},{"type":"error","name":"EmptyData","inputs":[]},{"type":"error","name":"FileAlreadyFinalized","inputs":[]},{"type":"error","name":"FileNotFinalized","inputs":[]},{"type":"error","name":"FileNotFound","inputs":[]},{"type":"error","name":"InsufficientPremium","inputs":[]},{"type":"error","name":"InvalidCID","inputs":[]},{"type":"error","name":"NotFileOwner","inputs":[]},{"type":"error","name":"PremiumTransferFailed","inputs":[]},{"type":"event","name":"BlockUploaded","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256","indexed":true},{"type":"uint256","name":"blockId","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"event","name":"FileCreated","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256","indexed":true},{"type":"address","name":"owner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"FileExtended","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256","indexed":true},{"type":"address","name":"owner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"FileFinalized","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256","indexed":true},{"type":"bytes","name":"cid","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"BLOCK_WRITE_PREMIUM","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addExistingBlock","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256"},{"type":"uint256","name":"blockId","internalType":"uint256"},{"type":"bool","name":"end","internalType":"bool"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"beneficiary","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract Block"}],"name":"blockContract","inputs":[]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"fileId","internalType":"uint256"}],"name":"createFile","inputs":[{"type":"bytes","name":"data","internalType":"bytes"},{"type":"bool","name":"end","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"fileId","internalType":"uint256"}],"name":"createFileEmpty","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"extendFile","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"fileCount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple[]","name":"blocks","internalType":"struct Block.BlockData[]","components":[{"type":"uint256","name":"id","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}]}],"name":"getFileBlocks","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple","name":"","internalType":"struct EVMFS.FileData","components":[{"type":"uint256","name":"id","internalType":"uint256"},{"type":"uint8","name":"status","internalType":"enum EVMFS.Status"},{"type":"bytes","name":"cid","internalType":"bytes"},{"type":"uint256[]","name":"blockIds","internalType":"uint256[]"}]}],"name":"getFileByCID","inputs":[{"type":"bytes","name":"cid","internalType":"bytes"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint8","name":"status","internalType":"enum EVMFS.Status"},{"type":"uint256","name":"blockCount","internalType":"uint256"},{"type":"address","name":"fileOwner","internalType":"address"}],"name":"getUploadProgress","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IEVMFSSubscription"}],"name":"subscription","inputs":[]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"blockId","internalType":"uint256"}],"name":"upload","inputs":[{"type":"uint256","name":"fileId","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"},{"type":"bool","name":"end","internalType":"bool"}]}]
Contract Creation Code
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