{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621669574",
    "entityType": "Track",
    "nonce": "0x7fcc9a255171e9910b22fea1bf173234c338049a22bbbf94b7b127eb372689e2",
    "signature": "0x1e836a10d09d4c681bea0a27c602c3ebc051b56b18ee854f5ef18bbdead850de6c5ce670a8f4c0dce846d6ba5806409eba514b41d6e03146b9e901b17ac8cc1c1c",
    "signer": "0xD24F8A2501472e4c9FD5dfCCDF80B550912c7FB0",
    "userId": "887242445"
  }
}