{
  "manageEntity": {
    "action": "Save",
    "entityId": "658349804",
    "entityType": "Track",
    "nonce": "0x6018799aba212588d7628f573e29040eafa91221385bbf63e786f013f0e1c339",
    "signature": "0x35674a96c795c609bd086a909c8c972ec25906c34bcb14d346b033bdda2e3bd43cb402fe55b5c4e32f56f65ede4f15ba67be6bb2e2b84b18267a6cde6370e3d11b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}