{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616243496",
    "entityType": "Track",
    "nonce": "0x2bd78cd554120f611604393b4dee09fc2363942224a81c50dcdbf29d7a379d4d",
    "signature": "0xa1bb4ed686de4a9a20130d7968527c13b3be1fddff709149e6393b2958e848b50796412e098e74d0ba50d58a916aa550dd3dfbbd404d2ad78bef8f21800321201b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}