{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0xdb10f5d0afb622a25186e723000cfdfc56612b645e23abf43dd411a6b56f174a",
    "signature": "0x76df3227d54f029c23fdce97a82c9c26614c0a405f64c6b0991cad677808565b25b411877bebf7955b139d9cfa0eeb8ac94e3f91af8452c8f1496b1d5dc459361b",
    "signer": "0xE96bC10111eAe5E5Ff964676f6da4CbbB467A2e6",
    "userId": "85294"
  }
}