{
  "manageEntity": {
    "action": "Save",
    "entityId": "199423919",
    "entityType": "Track",
    "nonce": "0xe7e617aff6ec107a93ec0118b62d18bcdf9259a7638033f631938e265bbf8937",
    "signature": "0x0a417c7643a0026ed44ea8b8c2f097eaead56b74ef3b0e9ff49918760fd195b03880b076ba079269f08a94e131551cfce80aea12fe9c4366da946facf9c2df1e1c",
    "signer": "0x690b8E3ECc02141CC0d8Cc1f257ee760EF482d86",
    "userId": "267813348"
  }
}