{
  "manageEntity": {
    "action": "Save",
    "entityId": "291633",
    "entityType": "Track",
    "nonce": "0x133285eaec157c02c75735eca4e8b4a1eacfaf847b22a1431223dedf74d78ef8",
    "signature": "0xe2578023ea429c39d7645f3116b3fafa7423e03263c6688e13adee10958a46fc2cba57df7b15cd8f8f0704c2b374420bcff78d5d73ddf4542f94bd88fd125caf1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}