{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401983376",
    "entityType": "Track",
    "nonce": "0xe4c53f4e19ee2863080cf19d7ec4d025cb95c7b7c5e2fb032251b8e6e2a679b5",
    "signature": "0x9b3f79f3b395ec6ed528ef01e84db96b09b299836f8da6f8ae96fef49035df105191f8202110f4bd14607e5fd54f5a1ee69f1054961def5bd5c6b91641f972161c",
    "signer": "0xb2F02534d11E6A4fCA3BCBe6Bd6Ad1aA049462Ca",
    "userId": "818521868"
  }
}