{
  "manageEntity": {
    "action": "Save",
    "entityId": "480252",
    "entityType": "Track",
    "nonce": "0xefef843a30a336de0a8ad8bda368ce6441da630a2e0f9eab421698f386e7d7f4",
    "signature": "0x5fa1e0f0aa67e26c5e8ca6f793ad5ed921719176bd986023cf70af4e05d9669b29bcada3ec216fa558f1ea69f8f9a4dd56f42535b7b95cb5d87e527073fc0c961c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}