{
  "manageEntity": {
    "action": "Save",
    "entityId": "577788577",
    "entityType": "Track",
    "nonce": "0xbfc73538e1128ed7ef9f4b8a688e92f574d8a0bf468ad2b0238ccfb4eeebabe4",
    "signature": "0x7510aa5718d4d188e70f1a4d42ed63c653dc70a3977440582689f6e82611a12456b6144a9a4c2c1aa7338de4e2e19e2505487034b113bb8dbbe2bac739df170f1b",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}