{
  "manageEntity": {
    "action": "Save",
    "entityId": "604564070",
    "entityType": "Track",
    "nonce": "0x991e750d94c8a90ad9ce3be4c21f34064a08b0db23fb984f66e6a9b2ea567b1e",
    "signature": "0x066b0923f7b0c507338d37f4b7f9f42a2057eb456e96232d885885cd9c8a472d51160ba87e8451ca01f04b2d0f9c34071d0ac9c1a467a59d20b039f6abdd69911b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}