{
  "manageEntity": {
    "action": "Save",
    "entityId": "730301059",
    "entityType": "Track",
    "nonce": "0x46ed07973d088fea6d472cf1bf5f2b31f6381bc00aadec14098c54bed9bfbe64",
    "signature": "0x1ec5047d80e4483f27780cdd5fae6a68dff2aacf3f5fd980c5713c3a83fbe9074bc9c644d20489bb620a8cc8768385ba0e4da4fe1b728ffa2f809cf2a57306bc1c",
    "signer": "0xC9e4fe89311517E71e968f6DE26A6c075A639F41",
    "userId": "964899801"
  }
}