{
  "manageEntity": {
    "action": "Save",
    "entityId": "1165815717",
    "entityType": "Track",
    "nonce": "1786729609077699125",
    "signature": "0xf7f038e1ca9f4b047bdb5eb9c8edb8d44fa13f3394b5b1bebba8d7778bcf65cf1bb653dead6e14d4ceaa44c79ef65d79ad3656e7f398e119e51ea151cf2e3a3d1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}