{
  "manageEntity": {
    "action": "Save",
    "entityId": "943638249",
    "entityType": "Track",
    "nonce": "0xac57c8c5149e15bb221e08175e7aa84fc7b3f23eba68c245d149dd064c754b8c",
    "signature": "0x9967c421823a558e0c14fb6200a09e1e500cd81bdc845d8c943062f6379a4900775197cd80d1ad94b487cd1b99c093e83f41d6cc1b045ce220f5fc61fbecca0e1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}