{
  "manageEntity": {
    "action": "Save",
    "entityId": "305047999",
    "entityType": "Track",
    "nonce": "0x81de9b199ce3833ed7181351e2e1d0c8fe446421162ef53db1c0473bb0822552",
    "signature": "0x76794b86ac6f4fe292037eb12dab881f2665728e9923d0ae4c254e35bf6fa0444c2ab3870a468d3bd349e934ba60f0e5641906d36e23868f970367dff7920ba91b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}