{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975074013",
    "entityType": "Track",
    "nonce": "0x759de5f52f39ec244872f8a0d8378634e51164159dcce3d9d37409f4f558b9cb",
    "signature": "0xdad51f32f1ab3565542c93efd442914fd901228ecfef17e90d986ebee715e462554f8f2f646baa8e318140449344591dc1f0a6761486856b0f602445154b2f1d1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}