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# @version 0.3.10
"""
@title Minter Proxy
@dev Middleware to allow multiple minters for a token.
"""

interface MERC20:
    def mint(_to: address, _value: uint256): nonpayable


event TransferOwnership:
    owner: address


TOKEN: public(immutable(address))


is_minter: public(HashMap[address, bool])

owner: public(address)
future_owner: public(address)


@external
def __init__(token: address):
    TOKEN = token

    self.owner = msg.sender


@external
def mint(_to: address, _value: uint256):
    assert self.is_minter[msg.sender]
    
    MERC20(TOKEN).mint(_to, _value)


@external
def set_minter(_minter: address, _is_approved: bool):
    assert msg.sender == self.owner

    self.is_minter[_minter] = _is_approved


@external
def commit_transfer_ownership(_future_owner: address):
    """
    @notice Transfer ownership to `_future_owner`
    @param _future_owner The account to commit as the future owner
    """
    assert msg.sender == self.owner  # dev: only owner

    self.future_owner = _future_owner


@external
def accept_transfer_ownership():
    """
    @notice Accept the transfer of ownership
    @dev Only the committed future owner can call this function
    """
    assert msg.sender == self.future_owner  # dev: only future owner

    self.owner = msg.sender
    log TransferOwnership(msg.sender)

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[{"name":"TransferOwnership","inputs":[{"name":"owner","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"token","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"mint","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_minter","inputs":[{"name":"_minter","type":"address"},{"name":"_is_approved","type":"bool"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"commit_transfer_ownership","inputs":[{"name":"_future_owner","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"accept_transfer_ownership","inputs":[],"outputs":[]},{"stateMutability":"view","type":"function","name":"TOKEN","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"is_minter","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"view","type":"function","name":"owner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"future_owner","inputs":[],"outputs":[{"name":"","type":"address"}]}]

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