{
  "manageEntity": {
    "action": "Save",
    "entityId": "1539744444",
    "entityType": "Track",
    "nonce": "0xdcdbc1e48d00f10cb53e30bce26a3812a8d49e5c12ba768c46cb7383a7399347",
    "signature": "0x618fb663c666337320f829b38611c256cee1e4624915d57cfac41950024bb8051cc3f8c41655a699caf632af1ebf2162004e3b70e3d5a1f4b84e119d0a49104a1b",
    "signer": "0x0168976438910D2f5330323a0d0141Fb4Af95032",
    "userId": "317847"
  }
}