{
  "manageEntity": {
    "action": "Save",
    "entityId": "148009165",
    "entityType": "Track",
    "nonce": "0x2e2165ac60194c739e9d899b5c2c5b660b05d93eae4d71bc0c11379858feb85a",
    "signature": "0xffcecc590c2936683219192392dbb59a4f873e195ec4f23383bf9c6a12c1141e6db830d0205a69414c853bf2bdd5dda36052c8ede2a280901d2757c386b5a9c91c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}