{
  "manageEntity": {
    "action": "Save",
    "entityId": "867568415",
    "entityType": "Track",
    "nonce": "0x7b2c1aa353ac877c3044a6df7397d406bce59293c5c5eaba6da76dc6620c9a7d",
    "signature": "0xe4ddd801e92896369d411837e50511740c1d122bde64b49b17896540e7019f3164220d5eaf86c67840bb9aab78ad640830ac86f4b097461c901118998c0e3f0a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}