{
  "manageEntity": {
    "action": "Save",
    "entityId": "396532243",
    "entityType": "Track",
    "nonce": "0xc21ffde4b87040ebb4dcdbeff42f901c2122f13eac20239ccab58b325c6aece2",
    "signature": "0x3b7c52128e6c653ce6d59e6f3536caa5231e0fdc24b4a1138a6f81feb63cd2bd59b69d995f607cb7a85b92dae63c5ecd688052a462bbf757a2da0d2e9f2c82ab1c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}