{
  "manageEntity": {
    "action": "Save",
    "entityId": "408958817",
    "entityType": "Track",
    "nonce": "0x52e3f1cba758ddc397703bcb35d85ee4d1d7e4cc45e3912a1a415715464b6420",
    "signature": "0xa0d6bf0f169a59bf59dee4cb4268816ab5ee7a2dcb60117dc7d267d891b76c4d765704f64e34c62be815d70a767e775fe18b912d2cf4dfc1b25aaf75ba2227541b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}