{
  "manageEntity": {
    "action": "Save",
    "entityId": "988508183",
    "entityType": "Track",
    "nonce": "0xabd435bf8b3bd8d8bcca2bf6a567562f198987b0fa97a8334aad4bd5ef6720ad",
    "signature": "0xb6fa2502c0e33a074c6b4070c89c65db0f3bb6ac14acd1bc52c21db1531753470fd089b0e80e2a00150e05ff7df30154f2f69c125c277ccb4ec0ca3c1736191b1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}