{
  "manageEntity": {
    "action": "Save",
    "entityId": "479081806",
    "entityType": "Track",
    "nonce": "0x1c8f967947903c5a8411b2cc6bb6e1e1931eb5a1ef495af165b2aad6d1b323db",
    "signature": "0x5ae12cc2c2f73639a99d4dbd87b4a27f38c182b7489b524fef0bd7c3466e680a4a72e4f9aebd68b87ab8fc12870958a311f163f041e076fe5fd56704fa81b83f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}