{
  "manageEntity": {
    "action": "Save",
    "entityId": "571486595",
    "entityType": "Track",
    "nonce": "0xba7ac1c1533682e2f612820aacb3b9a7e8806beb5e26a2fc83f53142531ba7a1",
    "signature": "0xfce5d4b0418c0ce43271acea2533099530ae57ffd0bf1b72b6189e97ce658b911647642e803885591bc3821f9264ae49ccd5d766cdb2e8c564ed956b5b1a1a811b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}