{
  "manageEntity": {
    "action": "Save",
    "entityId": "456214",
    "entityType": "Track",
    "nonce": "0x93880d7e29a2dadde46e6c4e2af4887d0693da250fa01a10d35813590dd6092b",
    "signature": "0xbd308e1475945a3630dbe611fea89547effbe83d9d889b1d8250d1e40fff8ca1241e7ede369deac8886bffa24c3f0ffd17d7f4b312b49ac538cf25332b9522c81c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}