{
  "manageEntity": {
    "action": "Save",
    "entityId": "769219591",
    "entityType": "Track",
    "nonce": "0x405448e1291b96faf06f0f95311b81f1f8cd1723fd19975cbc310ef568259c0a",
    "signature": "0x42ce9eb6e05e63465065ce325e45852c33fa3086862ef90ef94c16d3a3e4c104635580a394f272af857eb3319bdf42bb0d3fe2a2d2cc6e9a8ad937b553e9e9a51b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}