{
  "manageEntity": {
    "action": "Save",
    "entityId": "441821604",
    "entityType": "Track",
    "nonce": "0x9f913e2571a8b0bccfcc013702b73d1f96db695c64bd10a665603c2267950b32",
    "signature": "0x19d2885cdfee1c655bc3d1cfa675749b4057dff07be2371f0f42fccd406a2f764eac04bdc416989060034aeb21f345ddfb2f1ca9d02210fa7632bfc2b503fdb71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}