{
  "manageEntity": {
    "action": "Save",
    "entityId": "538729427",
    "entityType": "Track",
    "nonce": "0xce491f028d24788389aa684b09b8240218c4ef86a65adbde84e81f4ea6cf6102",
    "signature": "0xf0e73cced3dadc9f0bf8f2a79da1f001a1b7f25430ccff203f91b0eae8fb44df0e9ea9fa9bbe2ac24344489da09335954ce342af1c704f5a0dc19518d29c99571c",
    "signer": "0xBe0B2B2beC4B0A46ff11169512DF7f66E775c0B3",
    "userId": "196632465"
  }
}