{
  "manageEntity": {
    "action": "Save",
    "entityId": "338620244",
    "entityType": "Track",
    "nonce": "0xca3340903e464e4b039da02756f156a3034ba0aeac25a43d887dd2d13a64528f",
    "signature": "0x5af39beb74eb84bd6fcad375556ac535966d236febe07b513094c92c6af7c97a39a9e7183c0088abf493186e1167773724d1d0d1f0aad80bb33594fd89dfc3871c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}