{
  "manageEntity": {
    "action": "Save",
    "entityId": "1545442215",
    "entityType": "Track",
    "nonce": "0x76dedcc78d83aa4804aa95438c78e8393457c7efdc66dbec3da66c58da558f50",
    "signature": "0xe52b6b5a30f34ad788e7fe1c3a1867e398c8d837d8a852974b59c52fb02b1bcf0f5c01ae8c73aa89b00a6e960287c0f088034ef8fb64f0d8f91da7f92bb78c2f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}