{
  "manageEntity": {
    "action": "Save",
    "entityId": "1277699229",
    "entityType": "Track",
    "nonce": "0x658e58290cbba35a92aceaa4d76d3b8fe58020f0a68532ff2bee2f85867ec561",
    "signature": "0xea5b50cf9135bd7ddd32211cba8b2b2e4496a59e38b5698179e7e76f2c4f949f1ada24f32a52487b01b861bc690f3165b35fcb34831d4908db152414b648df151c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}