{
  "manageEntity": {
    "action": "Save",
    "entityId": "74426755",
    "entityType": "Track",
    "nonce": "0x2d704221386ded3d9a11051a9ae04061e594b584ce9ee5c040d2ff7b91f35b54",
    "signature": "0xf3cd79c65957c1ce97a0a41c1dc80a140b89c86e595f515a4118d565e465cc4e5933da2dbb198915067b0a0e377729fbbc47db8b7b64c2eb27eb3b4ae95dc4061b",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}