{
  "manageEntity": {
    "action": "Save",
    "entityId": "256449037",
    "entityType": "Track",
    "nonce": "0x9c98665795d1b2d78fd8cfdbce2080cd5c8319d01ec9ff64f2470047f8b16fc0",
    "signature": "0x5f0a2341b2ebd952e48833b34bde97905238a33b8301c7b3f8ef413b3d736fb97bf996ee57d0d240af2b98a933b468f234c7c9913b68a689053ff03d8c5171461b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}