Bitcoin does not reward you for finding just anything that hashes with enough zeroes at the front, it rewards you for finding blocks whose hash is less than the current target (which gives the appearance of requiring a number of leading zeroes).
A block is a data structure that contains Bitcoin transactions as well as a header with some additional information, such as the previous block's hash, a timestamp, nonce, version number, and the hash of all of the transactions in that block. This block header is what must have a hash less than the target. If you submit to the network something that is not a validly formatted block header, then, regardless of the hash, it will be rejected. Note that you don't just submit a hash, you submit the data that is hashed, along with the hash, so that nodes can independently verify the hash.
Lastly, miners are not rewarded by "blockchain watchers" nor are their identities known or approved. Miners are rewarded because they include a transaction in their blocks that pays themselves. This transaction must meet the rules for payouts, but the payment is up to the miners to claim by them making the transaction and including it in the block that they found. This transaction could pay to whomever the miner wants to, and it can pay to multiple people as well. It can also pay to nobody and instead burn the coins. The payment does not come from somebody else who verifies the miners' identities.