{
  "manageEntity": {
    "action": "Save",
    "entityId": "828422350",
    "entityType": "Track",
    "nonce": "0xedd643cd123dc3e8c9325894f9d1b443205e47e1420d461b07c7c77e517bc38a",
    "signature": "0xca0cd5439f8f7167c25678b8b17bb105c50f9b9c0b2fb4bf4f192c0cd40cc953695edf834c2d9f517954282f85858faf6c24dd84eeb465baadb9b81014f5eb1c1b",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}