{
  "manageEntity": {
    "action": "Save",
    "entityId": "655753050",
    "entityType": "Track",
    "nonce": "0x7c974438499981f2feb05dbbf47cb7ba821e6919af15878701a8a0ed3b07148b",
    "signature": "0x61dc4c9ca217a64f799488a8661fa7a9e5588472bcc79572c861726d58a5bcd56842c2100b4a40d2c041127e64814c126aa2bfb4b6dfb067fe7abf171cdca3f71b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}