{
  "manageEntity": {
    "action": "Save",
    "entityId": "647480856",
    "entityType": "Track",
    "nonce": "0x934ab00f2fbc10a6b863959f68f7d380e43488851574bdc93070f6f9e83aa052",
    "signature": "0x80f5747b682f2d5f30569d41d569cc4cd8f70bef47d1f936fda606067ae38e92617dc71bcf917feebe6eb139193cd3478b5f7ac76ff6b155a1836fe5b9e17d501c",
    "signer": "0xfE8b7901289A70702AC15CcB11911b872E54e80D",
    "userId": "540022120"
  }
}