{
  "manageEntity": {
    "action": "Save",
    "entityId": "148051",
    "entityType": "Track",
    "nonce": "0xd052fa0d638b32ac0f962ac763b85bcc31d91ac715f0aa89ed966f42f906d421",
    "signature": "0x206a9e0de13501aaabbf9e57998a320d201e97b32da0bc8fe117d1c6f245e7e346733b1530f82762814dcba410cb87822658598e9b089416bb2c1531e75fcf511c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}