{
  "manageEntity": {
    "action": "Save",
    "entityId": "1210184636",
    "entityType": "Track",
    "nonce": "0x75c827876439e307e7e5f50da14fe1e1c5e37e20ebf24157a158915b7248c8d9",
    "signature": "0xb9d87acd021ae5328af85ed3a67c384899d9fa35eb5c90c21e92063c49376ed60dcff37df05c66aa5e15fa13785b7e2dec7577ef6efddec69304731a282f01d61c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}