{
  "manageEntity": {
    "action": "Save",
    "entityId": "299449174",
    "entityType": "Track",
    "nonce": "0x73a613fd73b5615930d586ff1813d2642612a9e32b83e7dba8fea5e8cd5536d8",
    "signature": "0xd1a8f04508a3c33a5104a80c5cb3ff2fd01a7cd0018bf823610eae7cdf60cdac47da2963694704678fe7cad9fd67cb10cb741d709f9529235840eee2592857e51c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}