{
  "manageEntity": {
    "action": "Save",
    "entityId": "771205939",
    "entityType": "Track",
    "nonce": "0x931b0b2218b685e29d0ed13c9985023a2dfa7eaf68aa54d0b1e8d83aad09b3bd",
    "signature": "0x4747853f3b36e72602eef04a0997e8c2346625129afe71fb8c27080391fa0a5c54b595c2b765a25d4acb48097c87a871a9b73123f4b542a6489c597a128f1adc1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}