{
  "manageEntity": {
    "action": "Save",
    "entityId": "215851",
    "entityType": "Track",
    "nonce": "0x5ef0b916494b38359ff9d3bc714198c004d6ec7ff7837bb7cf3a7d173d3bda78",
    "signature": "0x0481bf35f99ecaf63219edb0f8c1026cbd5d1b19be5fb9a592a633e5772912b406b2928a4ff7f9b2d84bd85c7a3071ce80a45cee76c80722cce1c9b2814c67d81b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}