{
  "manageEntity": {
    "action": "Save",
    "entityId": "1959822874",
    "entityType": "Track",
    "nonce": "0x053a0dbc2c9119ce4115750842c2b0d8b42366a82875fe807398d51519df9cd1",
    "signature": "0xe66b37195f3a4aaa5d3073186828c9a591076dc3a2a4e945eda2053be36fe7c4316c04a553ec7761c3b73dad83329f9e68d6e79e02e13a328d639e1c91e67e7d1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}