{
  "manageEntity": {
    "action": "Save",
    "entityId": "2005144120",
    "entityType": "Track",
    "nonce": "0x5621df6e0ae7f19931e4425ee55acf04cd0963b547ada659851680aa7fa450fd",
    "signature": "0xd1af308a61c248ad8b245c241968be00840a4ed66436da8c11f9f40b885bf11571b7e5971dcd7feb8f9304b1e590ae54bc189b661318d8dd9b40463f53be00b41b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}