{
  "manageEntity": {
    "action": "Save",
    "entityId": "766729865",
    "entityType": "Track",
    "nonce": "0x9b4f653ad13361463354af2c4302f0830e43fa215953242d0dd0d3cbd6b666c3",
    "signature": "0xed2d5194e454cd8eb763b1f86b7bcf783c517cc685d67755cdd919f946e9d96951906f97d2171ac8a5c973615f45759fb3448f5f7eaafd17460250ac7bfa59ba1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}