{
  "manageEntity": {
    "action": "Save",
    "entityId": "1298620756",
    "entityType": "Track",
    "nonce": "0xf1ac2ded23b2976f1ea56c778512c5ee67cd60bda6e89be8642a9d4f75ee6974",
    "signature": "0xec9cc780c04120f48a6af15e7737848574fc08ac61a102bc96649fb40425111f4b486c6b4b6047113e93a1e4a0dd77f4bc5418702e6e6f5a99814ab7255a388b1c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}