{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516121046",
    "entityType": "Track",
    "nonce": "0xa25aa3e80749dc95ba47ff021fa76c58159313edc33dc6041afeac183e5dec78",
    "signature": "0x90a37be069dfc3e2575c1e8438755aa21829ed2cba64dfbde8a5a9387d7f65fa43a0ee4e2ece089a78d079613b155c6c17b59b2aee67889b946cbfdd2ffbf3a61b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}