{
  "manageEntity": {
    "action": "Save",
    "entityId": "383367867",
    "entityType": "Track",
    "nonce": "0x205b0af41e41d7fb9d152535c0e2b45d13fed8f47993780a24b38a4dc09f9c9a",
    "signature": "0x489d0484922219fe30d61f3b2b1f4eb99577c01ac43d68399240acf03ae9d81c11924ff7ca9718f8059b6bd9acc6cf5a141679d9f4d8923c16f3d4c58690bfa41b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}