{
  "manageEntity": {
    "action": "Save",
    "entityId": "465850",
    "entityType": "Track",
    "nonce": "0x1daa081e8786ce3f710fcacec21a18773a673990d80f6aaf7394d37674ad6d4a",
    "signature": "0xcf315bee65922ad93033662c6c1579705da3d71320c347f6d4a0ddd5ca58859804f6ad3612fac28cb807674b71a688d64c37fbc4242c3b6577eb385c9e5a2aa41c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}