{
  "manageEntity": {
    "action": "Save",
    "entityId": "210154",
    "entityType": "Track",
    "nonce": "0x08f448f173212365ab68f492d32d25cfa8d37c4ecba742d9c407e949bcdb86e3",
    "signature": "0xd8876df5423106d560d47dfa7f74b8bfb747ed094c92e0fe0808ca5d88be516e0930133e32173c05ac92b66d341df7b148260f7ab3cc8c932568b794625c3f691b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}