{
  "manageEntity": {
    "action": "Save",
    "entityId": "472534689",
    "entityType": "Track",
    "nonce": "0x61ef52f3b322bd82fdfe46b7bae13f96b343bde2571ab11c45be291b0bcf499a",
    "signature": "0x7102ee8ae496ecd653c51e0fc56b8040bf042e5112f015da4ad6a2a6a6f9503c28f97fa716bd383edf016e1f937addd495766f5ee01b8ef59bd8a953d3cc9f8d1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}