{
  "manageEntity": {
    "action": "Save",
    "entityId": "1839906388",
    "entityType": "Track",
    "nonce": "0x62b6e04605187a69785a0195ae3884229e7d915119325a4a0dba332d204a1828",
    "signature": "0x739db19066ef36cf9d64239d535c957bebb830e2c6924e8dacf687ee99f57808629a4f0538fc8ce9db9b01678dbcfd2c9582a9f5bc018c932e926333d5bc1e441c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}