{
  "manageEntity": {
    "action": "Save",
    "entityId": "253722715",
    "entityType": "Track",
    "nonce": "0x800d3c15a70569e2ba4d4ff825f985e8f4f59e39994d915b52548439af328cf3",
    "signature": "0xf17779a32d0106afbffc72d51d725403e3a8297542260c89bce922a9d94be4e637b316895186246f05957c7b0b3e1ea0a69bb0bc8d6e7f06308f121deb755b671c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}