{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573974518",
    "entityType": "Track",
    "nonce": "0xd2d2030e22590c6addc6aef402a8030797f28c409d49118b09f7601ab1fe4aaa",
    "signature": "0x2c0ce98917e671f50d8a418186ef83b358321295fdf4c7af53152925de5fadd07e01a36a5d91beb402c930f350e27efccac035e6b2ec52c4300673f5149904241b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}