{
  "manageEntity": {
    "action": "Save",
    "entityId": "1423877711",
    "entityType": "Track",
    "nonce": "0x131a6bb67b8ab166fcb42da794c78551c0fc00402fb86219f40c2a5354775cba",
    "signature": "0xb4d266abadf0c0fee39cd066135cab326ad127b5af23d0ab135bf02dd557f4f26b10ed3602725e038378069972536f2c95efacb3cc8794a1d780a2dc1372d2181c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}