CRYPTO NEWS

Bitcoin, Ethereum Technical Analysis: BTC Below $20,000, ETH Slips Under $1,000

Bitcoin fell below $20,000 on Saturday, as the sell-off in cryptocurrency markets continued to start the weekend. ETH was also trading below a key level, as prices fell below $1,000 for the first time in over 18 months.

Bitcoin

Bitcoin fell below $20,000 on Saturday, as bearish momentum extended entering the weekend.

Despite the best effort of bulls to hold the line, the recent price support of $20,200 finally gave way earlier today.

As a result of this, BTC/USD fell to an intraday low of $18,905.98 earlier in today’s session, which is the lowest level BTC has traded since December 2020.

Overall, BTC has fallen by nearly $13,000 since the beginning of the month, with the price now down 30% in the last seven days.

In addition to this, the Relative Strength Index (RSI) is trading at 20.9, which is its lowest point in over five years.

Bulls will likely see this as an opportunity, however with the current volatility in the market we may see more turbulence in upcoming weeks.

Ethereum

Similar to bitcoin, ETH fell below a key point on Saturday, with prices dropping below $1,000 for the first time since January 2020.

ETH/USD slipped to an intraday low of $986.85 to start the weekend, which is nearly marginally lower than yesterday’s peak at $1,105.23

This drop saw ETH breakout from its recent price floor of $1,050, which we outlined yesterday was one of the last lines of defense preventing a drop into the $900 region.

Percentage wise, the drop in ETH over the past seven days has been greater than in BTC, with prices here falling by nearly 40% since last Saturday.

As of writing, ethereum is trading over 50% lower than at the start of June, following a streak of almost two weeks worth of back-to-back declines.

Currently, prices have moved back above $1,000, however there will likely be more moves below this point as the weekend progresses.

Where will the next support point be in ETH? Leave your thoughts in the comments below.

How to use as tuple[] parameter in Remix interface (solidity, smart-contract)

Contract – RaribleUserToken Function: mint I have problem with "fees" argument My attempts: [‘0x0000000000000000000000000000000000000001’, 34] ["0x0000000000000000000000000000000000000001", 34] ‘0x0000000000000000000000000000000000000001’, 34 "0x0000000000000000000000000000000000000001", 34 0x0000000000000000000000000000000000000001, 34 etc I only get errors… Error encoding arguments: Error: invalid tuple value (argument="tuple", value="0x0000000000000000000000000000000000000001", code=INVALID_ARGUMENT, version=abi/5.1.2) transact to RaribleUserToken.mint errored: Error encoding arguments: Error: expected array value (argument=null, value="[‘0x0000000000000000000000000000000000000001’, 34]", code=INVALID_ARGUMENT, version=abi/5.1.2)::Listen

Contract – RaribleUserToken

Function: mint

I have problem with "fees" argument

My attempts: [‘0x0000000000000000000000000000000000000001’, 34] ["0x0000000000000000000000000000000000000001", 34] ‘0x0000000000000000000000000000000000000001’, 34 "0x0000000000000000000000000000000000000001", 34 0x0000000000000000000000000000000000000001, 34 etc

I only get errors…

Error encoding arguments: Error: invalid tuple value (argument="tuple", value="0x0000000000000000000000000000000000000001", code=INVALID_ARGUMENT, version=abi/5.1.2)

transact to RaribleUserToken.mint errored: Error encoding arguments: Error: expected array value (argument=null, value="[‘0x0000000000000000000000000000000000000001’, 34]", code=INVALID_ARGUMENT, version=abi/5.1.2)

ddd

Contract

pragma solidity ^0.5.0; pragma experimental ABIEncoderV2;    library SafeMath {          function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {                 if (a == 0) {             return 0;         }          c = a * b;         assert(c / a == b);         return c;     }      /**     * @dev Integer division of two numbers, truncating the quotient.     */     function div(uint256 a, uint256 b) internal pure returns (uint256) {         // assert(b > 0); // Solidity automatically throws when dividing by 0         // uint256 c = a / b;         // assert(a == b * c + a % b); // There is no case in which this doesn't hold         return a / b;     }          function sub(uint256 a, uint256 b) internal pure returns (uint256) {         assert(b <= a);         return a - b;     }          function add(uint256 a, uint256 b) internal pure returns (uint256 c) {         c = a + b;         assert(c >= a);         return c;     } }   contract CommonConstants {      bytes4 constant internal ERC1155_ACCEPTED = 0xf23a6e61; // bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))     bytes4 constant internal ERC1155_BATCH_ACCEPTED = 0xbc197c81; // bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)")) }   interface ERC1155TokenReceiver {         function onERC1155Received(address _operator, address _from, uint256 _id, uint256 _value, bytes calldata _data) external returns(bytes4);     function onERC1155BatchReceived(address _operator, address _from, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) external returns(bytes4); }   interface IERC165 {         function supportsInterface(bytes4 interfaceId) external view returns (bool); }   contract IERC1155 is IERC165 {          event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _value);          event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _values);           event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);           event URI(string _value, uint256 indexed _id);           function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external;           function safeBatchTransferFrom(address _from, address _to, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) external;           function balanceOf(address _owner, uint256 _id) external view returns (uint256);         function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids) external view returns (uint256[] memory);          function setApprovalForAll(address _operator, bool _approved) external;          function isApprovedForAll(address _owner, address _operator) external view returns (bool); }   contract ERC165 is IERC165 {     /*      * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7      */     bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;      /**      * @dev Mapping of interface ids to whether or not it's supported.      */     mapping(bytes4 => bool) private _supportedInterfaces;      constructor () internal {         // Derived contracts need only register support for their own interfaces,         // we register support for ERC165 itself here         _registerInterface(_INTERFACE_ID_ERC165);     }          function supportsInterface(bytes4 interfaceId) external view returns (bool) {         return _supportedInterfaces[interfaceId];     }          function _registerInterface(bytes4 interfaceId) internal {         require(interfaceId != 0xffffffff, "ERC165: invalid interface id");         _supportedInterfaces[interfaceId] = true;     } }   library Address {          function isContract(address account) internal view returns (bool) {         // According to EIP-1052, 0x0 is the value returned for not-yet created accounts         // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned         // for accounts without code, i.e. `keccak256('')`         bytes32 codehash;         bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;         // solhint-disable-next-line no-inline-assembly         assembly { codehash := extcodehash(account) }         return (codehash != accountHash && codehash != 0x0);     }          function toPayable(address account) internal pure returns (address payable) {         return address(uint160(account));     }          function sendValue(address payable recipient, uint256 amount) internal {         require(address(this).balance >= amount, "Address: insufficient balance");          // solhint-disable-next-line avoid-call-value         (bool success, ) = recipient.call.value(amount)("");         require(success, "Address: unable to send value, recipient may have reverted");     } }  // A sample implementation of core ERC1155 function. contract ERC1155 is IERC1155, ERC165, CommonConstants {     using SafeMath for uint256;     using Address for address;      // id => (owner => balance)     mapping (uint256 => mapping(address => uint256)) internal balances;      // owner => (operator => approved)     mapping (address => mapping(address => bool)) internal operatorApproval;  /////////////////////////////////////////// ERC165 //////////////////////////////////////////////      /*         bytes4(keccak256("safeTransferFrom(address,address,uint256,uint256,bytes)")) ^         bytes4(keccak256("safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)")) ^         bytes4(keccak256("balanceOf(address,uint256)")) ^         bytes4(keccak256("balanceOfBatch(address[],uint256[])")) ^         bytes4(keccak256("setApprovalForAll(address,bool)")) ^         bytes4(keccak256("isApprovedForAll(address,address)"));     */     bytes4 constant private INTERFACE_SIGNATURE_ERC1155 = 0xd9b67a26;  /////////////////////////////////////////// CONSTRUCTOR //////////////////////////////////////////      constructor() public {         _registerInterface(INTERFACE_SIGNATURE_ERC1155);     }  /////////////////////////////////////////// ERC1155 //////////////////////////////////////////////              function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external {          require(_to != address(0x0), "_to must be non-zero.");         require(_from == msg.sender || operatorApproval[_from][msg.sender] == true, "Need operator approval for 3rd party transfers.");          // SafeMath will throw with insuficient funds _from         // or if _id is not valid (balance will be 0)         balances[_id][_from] = balances[_id][_from].sub(_value);         balances[_id][_to]   = _value.add(balances[_id][_to]);          // MUST emit event         emit TransferSingle(msg.sender, _from, _to, _id, _value);          // Now that the balance is updated and the event was emitted,         // call onERC1155Received if the destination is a contract.         if (_to.isContract()) {             _doSafeTransferAcceptanceCheck(msg.sender, _from, _to, _id, _value, _data);         }     }           function safeBatchTransferFrom(address _from, address _to, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) external {          // MUST Throw on errors         require(_to != address(0x0), "destination address must be non-zero.");         require(_ids.length == _values.length, "_ids and _values array lenght must match.");         require(_from == msg.sender || operatorApproval[_from][msg.sender] == true, "Need operator approval for 3rd party transfers.");          for (uint256 i = 0; i < _ids.length; ++i) {             uint256 id = _ids[i];             uint256 value = _values[i];              // SafeMath will throw with insuficient funds _from             // or if _id is not valid (balance will be 0)             balances[id][_from] = balances[id][_from].sub(value);             balances[id][_to]   = value.add(balances[id][_to]);         }          // Note: instead of the below batch versions of event and acceptance check you MAY have emitted a TransferSingle         // event and a subsequent call to _doSafeTransferAcceptanceCheck in above loop for each balance change instead.         // Or emitted a TransferSingle event for each in the loop and then the single _doSafeBatchTransferAcceptanceCheck below.         // However it is implemented the balance changes and events MUST match when a check (i.e. calling an external contract) is done.          // MUST emit event         emit TransferBatch(msg.sender, _from, _to, _ids, _values);          // Now that the balances are updated and the events are emitted,         // call onERC1155BatchReceived if the destination is a contract.         if (_to.isContract()) {             _doSafeBatchTransferAcceptanceCheck(msg.sender, _from, _to, _ids, _values, _data);         }     }          function balanceOf(address _owner, uint256 _id) external view returns (uint256) {         // The balance of any account can be calculated from the Transfer events history.         // However, since we need to keep the balances to validate transfer request,         // there is no extra cost to also privide a querry function.         return balances[_id][_owner];     }           function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids) external view returns (uint256[] memory) {          require(_owners.length == _ids.length);          uint256[] memory balances_ = new uint256[](_owners.length);          for (uint256 i = 0; i < _owners.length; ++i) {             balances_[i] = balances[_ids[i]][_owners[i]];         }          return balances_;     }          function setApprovalForAll(address _operator, bool _approved) external {         operatorApproval[msg.sender][_operator] = _approved;         emit ApprovalForAll(msg.sender, _operator, _approved);     }          function isApprovedForAll(address _owner, address _operator) external view returns (bool) {         return operatorApproval[_owner][_operator];     }  /////////////////////////////////////////// Internal //////////////////////////////////////////////      function _doSafeTransferAcceptanceCheck(address _operator, address _from, address _to, uint256 _id, uint256 _value, bytes memory _data) internal {                             require(ERC1155TokenReceiver(_to).onERC1155Received(_operator, _from, _id, _value, _data) == ERC1155_ACCEPTED, "contract returned an unknown value from onERC1155Received");     }      function _doSafeBatchTransferAcceptanceCheck(address _operator, address _from, address _to, uint256[] memory _ids, uint256[] memory _values, bytes memory _data) internal {                           require(ERC1155TokenReceiver(_to).onERC1155BatchReceived(_operator, _from, _ids, _values, _data) == ERC1155_BATCH_ACCEPTED, "contract returned an unknown value from onERC1155BatchReceived");     } }  library UintLibrary {     function toString(uint256 _i) internal pure returns (string memory) {         if (_i == 0) {             return "0";         }         uint j = _i;         uint len;         while (j != 0) {             len++;             j /= 10;         }         bytes memory bstr = new bytes(len);         uint k = len - 1;         while (_i != 0) {             bstr[k--] = byte(uint8(48 + _i % 10));             _i /= 10;         }         return string(bstr);     } }  library StringLibrary {     using UintLibrary for uint256;      function append(string memory _a, string memory _b) internal pure returns (string memory) {         bytes memory _ba = bytes(_a);         bytes memory _bb = bytes(_b);         bytes memory bab = new bytes(_ba.length + _bb.length);         uint k = 0;         for (uint i = 0; i < _ba.length; i++) bab[k++] = _ba[i];         for (uint i = 0; i < _bb.length; i++) bab[k++] = _bb[i];         return string(bab);     }      function append(string memory _a, string memory _b, string memory _c) internal pure returns (string memory) {         bytes memory _ba = bytes(_a);         bytes memory _bb = bytes(_b);         bytes memory _bc = bytes(_c);         bytes memory bbb = new bytes(_ba.length + _bb.length + _bc.length);         uint k = 0;         for (uint i = 0; i < _ba.length; i++) bbb[k++] = _ba[i];         for (uint i = 0; i < _bb.length; i++) bbb[k++] = _bb[i];         for (uint i = 0; i < _bc.length; i++) bbb[k++] = _bc[i];         return string(bbb);     }      function recover(string memory message, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {         bytes memory msgBytes = bytes(message);         bytes memory fullMessage = concat(             bytes("x19Ethereum Signed Message:n"),             bytes(msgBytes.length.toString()),             msgBytes,             new bytes(0), new bytes(0), new bytes(0), new bytes(0)         );         return ecrecover(keccak256(fullMessage), v, r, s);     }      function concat(bytes memory _ba, bytes memory _bb, bytes memory _bc, bytes memory _bd, bytes memory _be, bytes memory _bf, bytes memory _bg) internal pure returns (bytes memory) {         bytes memory resultBytes = new bytes(_ba.length + _bb.length + _bc.length + _bd.length + _be.length + _bf.length + _bg.length);         uint k = 0;         for (uint i = 0; i < _ba.length; i++) resultBytes[k++] = _ba[i];         for (uint i = 0; i < _bb.length; i++) resultBytes[k++] = _bb[i];         for (uint i = 0; i < _bc.length; i++) resultBytes[k++] = _bc[i];         for (uint i = 0; i < _bd.length; i++) resultBytes[k++] = _bd[i];         for (uint i = 0; i < _be.length; i++) resultBytes[k++] = _be[i];         for (uint i = 0; i < _bf.length; i++) resultBytes[k++] = _bf[i];         for (uint i = 0; i < _bg.length; i++) resultBytes[k++] = _bg[i];         return resultBytes;     } }  contract HasContractURI is ERC165 {      string public contractURI;      /*      * bytes4(keccak256('contractURI()')) == 0xe8a3d485      */     bytes4 private constant _INTERFACE_ID_CONTRACT_URI = 0xe8a3d485;      constructor(string memory _contractURI) public {         contractURI = _contractURI;         _registerInterface(_INTERFACE_ID_CONTRACT_URI);     }      /**      * @dev Internal function to set the contract URI      * @param _contractURI string URI prefix to assign      */     function _setContractURI(string memory _contractURI) internal {         contractURI = _contractURI;     } }  contract HasTokenURI {     using StringLibrary for string;      //Token URI prefix     string public tokenURIPrefix;      // Optional mapping for token URIs     mapping(uint256 => string) private _tokenURIs;      constructor(string memory _tokenURIPrefix) public {         tokenURIPrefix = _tokenURIPrefix;     }           function _tokenURI(uint256 tokenId) internal view returns (string memory) {         return tokenURIPrefix.append(_tokenURIs[tokenId]);     }       function _setTokenURI(uint256 tokenId, string memory uri) internal {         _tokenURIs[tokenId] = uri;     }      /**      * @dev Internal function to set the token URI prefix.      * @param _tokenURIPrefix string URI prefix to assign      */     function _setTokenURIPrefix(string memory _tokenURIPrefix) internal {         tokenURIPrefix = _tokenURIPrefix;     }      function _clearTokenURI(uint256 tokenId) internal {         if (bytes(_tokenURIs[tokenId]).length != 0) {             delete _tokenURIs[tokenId];         }     } }   contract Context {     // Empty internal constructor, to prevent people from mistakenly deploying     // an instance of this contract, which should be used via inheritance.     constructor () internal { }     // solhint-disable-previous-line no-empty-blocks      function _msgSender() internal view returns (address payable) {         return msg.sender;     }      function _msgData() internal view returns (bytes memory) {         this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691         return msg.data;     } }   contract Ownable is Context {     address private _owner;      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);      /**      * @dev Initializes the contract setting the deployer as the initial owner.      */     constructor () internal {         address msgSender = _msgSender();         _owner = msgSender;         emit OwnershipTransferred(address(0), msgSender);     }      /**      * @dev Returns the address of the current owner.      */     function owner() public view returns (address) {         return _owner;     }      /**      * @dev Throws if called by any account other than the owner.      */     modifier onlyOwner() {         require(isOwner(), "Ownable: caller is not the owner");         _;     }      /**      * @dev Returns true if the caller is the current owner.      */     function isOwner() public view returns (bool) {         return _msgSender() == _owner;     }         function renounceOwnership() public onlyOwner {         emit OwnershipTransferred(_owner, address(0));         _owner = address(0);     }         function transferOwnership(address newOwner) public onlyOwner {         _transferOwnership(newOwner);     }      /**      * @dev Transfers ownership of the contract to a new account (`newOwner`).      */     function _transferOwnership(address newOwner) internal {         require(newOwner != address(0), "Ownable: new owner is the zero address");         emit OwnershipTransferred(_owner, newOwner);         _owner = newOwner;     } }  /**     Note: The ERC-165 identifier for this interface is 0x0e89341c. */ interface IERC1155Metadata_URI {         function uri(uint256 _id) external view returns (string memory); }  /**     Note: The ERC-165 identifier for this interface is 0x0e89341c. */ contract ERC1155Metadata_URI is IERC1155Metadata_URI, HasTokenURI {      constructor(string memory _tokenURIPrefix) HasTokenURI(_tokenURIPrefix) public {      }      function uri(uint256 _id) external view returns (string memory) {         return _tokenURI(_id);     } }  contract HasSecondarySaleFees is ERC165 {      event SecondarySaleFees(uint256 tokenId, address[] recipients, uint[] bps);           bytes4 private constant _INTERFACE_ID_FEES = 0xb7799584;      constructor() public {         _registerInterface(_INTERFACE_ID_FEES);     }      function getFeeRecipients(uint256 id) public view returns (address payable[] memory);     function getFeeBps(uint256 id) public view returns (uint[] memory); }  contract ERC1155Base is HasSecondarySaleFees, Ownable, ERC1155Metadata_URI, HasContractURI, ERC1155 {      struct Fee {         address payable recipient;         uint256 value;     }      // id => creator     mapping (uint256 => address) public creators;     // id => fees     mapping (uint256 => Fee[]) public fees;      constructor(string memory contractURI, string memory tokenURIPrefix) HasContractURI(contractURI) ERC1155Metadata_URI(tokenURIPrefix) public {      }      function getFeeRecipients(uint256 id) public view returns (address payable[] memory) {         Fee[] memory _fees = fees[id];         address payable[] memory result = new address payable[](_fees.length);         for (uint i = 0; i < _fees.length; i++) {             result[i] = _fees[i].recipient;         }         return result;     }      function getFeeBps(uint256 id) public view returns (uint[] memory) {         Fee[] memory _fees = fees[id];         uint[] memory result = new uint[](_fees.length);         for (uint i = 0; i < _fees.length; i++) {             result[i] = _fees[i].value;         }         return result;     }      // Creates a new token type and assings _initialSupply to minter     function _mint(uint256 _id, Fee[] memory _fees, uint256 _supply, string memory _uri) internal {         require(creators[_id] == address(0x0), "Token is already minted");         require(_supply != 0, "Supply should be positive");         require(bytes(_uri).length > 0, "uri should be set");          creators[_id] = msg.sender;         address[] memory recipients = new address[](_fees.length);         uint[] memory bps = new uint[](_fees.length);         for (uint i = 0; i < _fees.length; i++) {             require(_fees[i].recipient != address(0x0), "Recipient should be present");             require(_fees[i].value != 0, "Fee value should be positive");             fees[_id].push(_fees[i]);             recipients[i] = _fees[i].recipient;             bps[i] = _fees[i].value;         }         if (_fees.length > 0) {             emit SecondarySaleFees(_id, recipients, bps);         }         balances[_id][msg.sender] = _supply;         _setTokenURI(_id, _uri);          // Transfer event with mint semantic         emit TransferSingle(msg.sender, address(0x0), msg.sender, _id, _supply);         emit URI(_uri, _id);     }      function burn(address _owner, uint256 _id, uint256 _value) external {          require(_owner == msg.sender || operatorApproval[_owner][msg.sender] == true, "Need operator approval for 3rd party burns.");          // SafeMath will throw with insuficient funds _owner         // or if _id is not valid (balance will be 0)         balances[_id][_owner] = balances[_id][_owner].sub(_value);          // MUST emit event         emit TransferSingle(msg.sender, _owner, address(0x0), _id, _value);     }          function _setTokenURI(uint256 tokenId, string memory uri) internal {         require(creators[tokenId] != address(0x0), "_setTokenURI: Token should exist");         super._setTokenURI(tokenId, uri);     }      function setTokenURIPrefix(string memory tokenURIPrefix) public onlyOwner {         _setTokenURIPrefix(tokenURIPrefix);     }      function setContractURI(string memory contractURI) public onlyOwner {         _setContractURI(contractURI);     } }  /**  * @title Roles  * @dev Library for managing addresses assigned to a Role.  */ library Roles {     struct Role {         mapping (address => bool) bearer;     }      /**      * @dev Give an account access to this role.      */     function add(Role storage role, address account) internal {         require(!has(role, account), "Roles: account already has role");         role.bearer[account] = true;     }      /**      * @dev Remove an account's access to this role.      */     function remove(Role storage role, address account) internal {         require(has(role, account), "Roles: account does not have role");         role.bearer[account] = false;     }          function has(Role storage role, address account) internal view returns (bool) {         require(account != address(0), "Roles: account is the zero address");         return role.bearer[account];     } }  contract SignerRole is Context {     using Roles for Roles.Role;      event SignerAdded(address indexed account);     event SignerRemoved(address indexed account);      Roles.Role private _signers;      constructor () internal {         _addSigner(_msgSender());     }      modifier onlySigner() {         require(isSigner(_msgSender()), "SignerRole: caller does not have the Signer role");         _;     }      function isSigner(address account) public view returns (bool) {         return _signers.has(account);     }      function addSigner(address account) public onlySigner {         _addSigner(account);     }      function renounceSigner() public {         _removeSigner(_msgSender());     }      function _addSigner(address account) internal {         _signers.add(account);         emit SignerAdded(account);     }      function _removeSigner(address account) internal {         _signers.remove(account);         emit SignerRemoved(account);     } }       contract RaribleToken is Ownable, SignerRole, ERC1155Base {     string public name;     string public symbol;      constructor(string memory _name, string memory _symbol, address signer, string memory contractURI, string memory tokenURIPrefix) ERC1155Base(contractURI, tokenURIPrefix) public {         name = _name;         symbol = _symbol;          _addSigner(signer);         _registerInterface(bytes4(keccak256('MINT_WITH_ADDRESS')));     }      function addSigner(address account) public onlyOwner {         _addSigner(account);     }      function removeSigner(address account) public onlyOwner {         _removeSigner(account);     }      function mint(uint256 id, Fee[] memory fees, uint256 supply, string memory uri) onlyOwner public {              _mint(id, fees, supply, uri);     } }    contract RaribleUserToken is RaribleToken {     event CreateERC1155_v1(address indexed creator, string name, string symbol);      constructor(string memory name, string memory symbol, string memory contractURI, string memory tokenURIPrefix, address signer) RaribleToken(name, symbol, signer, contractURI, tokenURIPrefix) public {         emit CreateERC1155_v1(msg.sender, name, symbol);     }      } 

Bitcoin, Ethereum Technical Analysis: BTC Below $20,000, ETH Slips Under $1,000

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