{
  "manageEntity": {
    "action": "Save",
    "entityId": "131478858",
    "entityType": "Track",
    "nonce": "0x57da3d1e872417d186e4017a2c00513bf8eff84a9426c58a1ded5e494e7264f1",
    "signature": "0x08369aec707ae9ed158b9a84583971da346096d9b41d46ae7dd9d6df03c7bd7b767b31491612f5c9a88e9a1efa1f7adbca8fe3abdd9f485584e3f7ac3ffafbc41b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}