{
  "manageEntity": {
    "action": "Save",
    "entityId": "691640",
    "entityType": "Track",
    "nonce": "0xbfe3abd8fd7496c966f005ac8ea221d95cc9b93af5ea022d770b5f6fc087f8c9",
    "signature": "0xe0faccbeec5019654bddfc690f7b8450e4d463c1608a4c4a243c885081ecc6d85967ceb3bd066f8c86ae4726cced8c7d459cc87873555cd5165599223e1e53ac1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}