{
  "manageEntity": {
    "action": "Save",
    "entityId": "2038302681",
    "entityType": "Track",
    "nonce": "0xd72fc514171dc8526d91b34365370e8ab41fe17949c74e254f2c8207348f3364",
    "signature": "0xed980f692d81277f469372ba6f144ce817951d18558cbdc3f98c3bfe2ca0382444910e7e81eb0c59b02166794b150ce771e31e9c52d49348fea215b14679a4c41c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}