{
  "manageEntity": {
    "action": "Save",
    "entityId": "1237098644",
    "entityType": "Track",
    "nonce": "0x46f47efc8a441fdf22f26f5a61e103a5a32ab71a61e3ce871be8a3cb350943bb",
    "signature": "0x16353bc550c8c0867d53b559240155ce35dfa7d8fd203a11e6b6f4f81ab38ef64272839126c746cec8bbfa17f890d2d9a9620bea36b0330713d162155ed5c8bb1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}