{
  "manageEntity": {
    "action": "Save",
    "entityId": "307468",
    "entityType": "Track",
    "nonce": "0x6587ab89f1292dd71bf43acf5f621646df2713231671686ee062b360820f59bb",
    "signature": "0xb52dd8d85278909d4724387fd0b1c7739d505d056a36bcaab73144bb921e99d51646b7cd99616aabe462c794b4cf9b80b1b23c3c4ebde1632f12b73569d23f991b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}