{
  "manageEntity": {
    "action": "Save",
    "entityId": "471841370",
    "entityType": "Track",
    "nonce": "0x974e5cb9d9a744987cecb0b6474a4d622d06ddb632973f858d6df9249b125abe",
    "signature": "0x65d85da70c13374a3b29f1f3730139ecf604eec5e4cf1c2399ad0d00f945870d24f7dfae6c360e5685b5156bae4185628b851880d19420ea9a4cb8d7cce13a4a1c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}