{
  "manageEntity": {
    "action": "Save",
    "entityId": "375909763",
    "entityType": "Track",
    "nonce": "0x09e6fb7768c54b186a5b1ab69a6f79538ebd025b0ff5a934df65117a92c48df4",
    "signature": "0xaa57ef683ef1ae30d1c86b03294014f580291c2ef7dfb7b3938863c70d57e60e58e9543c3bd3a640dd2de7f5b76a0fc59a226369b33e224e916e976fd2c63dea1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}