{
  "manageEntity": {
    "action": "Save",
    "entityId": "303233680",
    "entityType": "Track",
    "nonce": "0x3678c1b7a8575b5c9b00923844e20f77df06b002fa55a2ec0426cc374bc8f477",
    "signature": "0xed5301ba60f2e032c4c44ccbff8c9663a105c021d92ce8a4527be7816686b29353056d9e06c3936272f3b3803f6642b7ecb56c7afb0a0f54a33eca610f9952bd1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}