{
  "manageEntity": {
    "action": "Save",
    "entityId": "390317790",
    "entityType": "Track",
    "nonce": "0x97668644c6872b3e94b7f5f690b885c15653fae2671fea125d00817a27e0f080",
    "signature": "0xa3595c0bceb727dfd2773e5b26b1bf4c91d71eded90b0235bd88388272634eee1510893480985179229591ea1e55dad7fbc715014366de79f064846a0aa4d2831b",
    "signer": "0x66eB52D64EEC44241f036b2978F734CB3B38DdCD",
    "userId": "882321302"
  }
}