{
  "manageEntity": {
    "action": "Save",
    "entityId": "708450587",
    "entityType": "Track",
    "nonce": "0xd98cce264e1d2cf605e6d4549d22c600270f47ec971a9f5a2a2188056f3f9e97",
    "signature": "0xfdc11ab21ca87a8e6f8278b757f0f6547494198691fca4f07b3e1bf2a9b31395362535baf4654c4e657e8b9d42ce4ec4e3270884d2dbe54a947f3453c60f65d81c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}