{
  "manageEntity": {
    "action": "Save",
    "entityId": "445542978",
    "entityType": "Track",
    "nonce": "0x9632c146654ba57032bac0c0c58a32b1b3a68c9246a1a2160e412e5824b7714c",
    "signature": "0x529d26acddca4c6ecf212337fee4639edf16adb8d6a3b3da3d12058d12b496076a8c2433db3256d0cacc38736a1d09710296c091f4755b4937d8ca0903e4840e1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}