{
  "manageEntity": {
    "action": "Save",
    "entityId": "538768",
    "entityType": "Track",
    "nonce": "0x68ae5b1fd89bf5a4eae5063516c78c66d5c1987830445c1622d5675902e248c6",
    "signature": "0xb3bbf30617de7bdecb19b7a0f1ffc07719eebede60e377c447bb355d1479391a784648be654a1addcca5ad2b3418f6374ed01828440e12370c65baf8d2e4201e1b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}