{
  "manageEntity": {
    "action": "Save",
    "entityId": "789558985",
    "entityType": "Track",
    "nonce": "0xf634f770691cfd8e9e212bbed54ef7601292c06e29ff903c2ba861d54f582894",
    "signature": "0xdb5500d2546408d17569e23dac737725813c7a8c39e98227a01c66ebb7432e8752c9c3269b5c6cd5a5a8426389267410d268170cf4cb5dc8d693039ad2dc2cb01b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}