{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619677751",
    "entityType": "Track",
    "nonce": "0x87e2f782c2cca524aa14ab9efda5f6e1ac0f5d8378c9e37392d3a8cdc1fa7a1d",
    "signature": "0xe8567443ed694d2be7e0c967959fcfcd65b596664ff5841e8ae40ba65cc3435e5e21832c4930f329399595d055a3dd70e15a901c594891018fc443af947c31f11c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}