{
  "manageEntity": {
    "action": "Save",
    "entityId": "212471742",
    "entityType": "Track",
    "nonce": "0x3a4461cfd80d044fe073060991f94649bae701b97bc7e503f4a8f55ca830cc7d",
    "signature": "0x40fe2daf11def73e711e5f02dcddc009dc0a67a759a4ea3956e25bddf8b7a48745fbd4c7ab02c2d9409264602d8b0127d3167e04bffa49a3e2c349158b5ed3c41b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}