{
  "manageEntity": {
    "action": "Save",
    "entityId": "1846471980",
    "entityType": "Track",
    "nonce": "0xed9a7129136901d7232be486e4d4453e1e2f194fb442daa65cdeb656be2997fd",
    "signature": "0xcb4698424bca42adeb991e617adae4974e71a34142e9239002b45b8496effd7c70a262f4038a08ddb682c9b53818336d6d1edb1717acfbe9d8a20701825d62d21b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}