{
  "manageEntity": {
    "action": "Save",
    "entityId": "804565958",
    "entityType": "Track",
    "nonce": "0x3735b050bd0f91b809e9b6f22087e517c96b47b2c3be0d2e8767a82e2584f845",
    "signature": "0x77f26b559547f88176e093882c9fd5a6d64097aec4d2268a1ca3deedea48e47062357ad4944bd64b895dcab96bfc9b1323f01834e2a8deca3d8d690723277f5f1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}