{
  "manageEntity": {
    "action": "Save",
    "entityId": "950323",
    "entityType": "Track",
    "nonce": "0x5ce284c5e3d39bc0e6501bd2d2e85a7651fe22dd57813976557a01e7c281c69c",
    "signature": "0x149488741e105deab4669e4e27b716e788295d7501c13a7632e72c7cf3ccec2255893b0b38f3d7c09c87b4dbfa5453b636090c47a57a17ec280e8beaf5703a501c",
    "signer": "0xF0eef53Ea6799dc756c433c2569813AFF947ffa9",
    "userId": "297534"
  }
}