{
  "manageEntity": {
    "action": "Save",
    "entityId": "1521770840",
    "entityType": "Track",
    "nonce": "0x798e53e30c8ef1135b43cd6fec51b8602e7752d2abdfc572aff362a29d4027dc",
    "signature": "0x5273db85dc6a227a3caffaa89ade6879c8dff82444b0844f019f6d39814ddc642873d0a38d9f4702427897af32391f8647b0b7bff5a68564ec6cff4b55800c961c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}