{
  "manageEntity": {
    "action": "Save",
    "entityId": "1804452015",
    "entityType": "Track",
    "nonce": "0x0ff8e5b4bc346cea3e3330dfc9471a82ca4482e024e56934ed44d1bf1dcd3e3f",
    "signature": "0x4d787bbc75f89af2151eb732f4a62e7e05645f2da5121c5f5e061a7c7352373700f0a7b4aad1afc1ec61e5562a829f37d89c32181d3c47723e8cc9ae506851ec1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}