{
  "manageEntity": {
    "action": "Save",
    "entityId": "464571",
    "entityType": "Track",
    "nonce": "0x0cb16b63b760c4e2207ada502b14b2e1bbb09e707da6ec566c7c1759eff54bd9",
    "signature": "0x33b2f842bbfe03bdbf129cb54be59b9ae2c18def53c2f735acb951ea17e134bd47d3e8bc3855a0419aab0da0c76a7fa53c7a647dd58811cd6d32084d549eae891c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}