{
  "manageEntity": {
    "action": "Save",
    "entityId": "58437122",
    "entityType": "Track",
    "nonce": "0x39654126ad868bb54d03bc7cd56333e29ffccac72031c75c51d78e4bb370deeb",
    "signature": "0xa624623c2ddad5378909d9ef2fccb647225cb863aefc1398de5839b6db5d7c8c20231bb8273c83a4d59a212696cb6092e8bde9ab35540a84327fd2ac22ece3531b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}