{
  "manageEntity": {
    "action": "Save",
    "entityId": "351558519",
    "entityType": "Track",
    "nonce": "0xf19bd03dbb9b23c9b0b494d9b45908129a1bbb7181d66df1d8ff0d8382fd209b",
    "signature": "0xf282487ada15a4dd334cc89cbf075d86ef11387f21892b848bee26e660a134b50b43fb8a6d4baf3013d4968f594b96305ba689c52271c745ea5c58c3b34f60311b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}